How to make HTML table expand on click?

Question

I am rendering HTML table with the help of JavaScript. I have made the table successfully, but now I have one requirement to show some new data in a row like on click expand

Answer 1

To achieve expected result, use below option of creating new table inside clicked td

1. On Click of plus icon, get the brand name
2. Filter items from data using brandname
3. Creating table with items for that brand
4. Hiding items row on selecting other row using class-itemsRow
5. On Clicking already selecting , remove style display: none , instead of re-creating table

function format(number, decimals = 2, locale = 'en-in') {
  const fixed = parseInt(number).toFixed(decimals);
  const [int, dec] = fixed.split('.')
  const intFormatted = (+int).toLocaleString(locale)
  return intFormatted + (dec ? '.' + dec : '');
}
var data = [{
    "outlet": "JAYANAGAR",
    "brandname": "Bakery FG",
    "itemname": "Khara Boondhi-L",
    "transactionType": "TransferIn",
    "netamount": 980
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Bakery FG",
    "itemname": "Samosa-L",
    "transactionType": "TransferIn",
    "netamount": 130
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Bakery FG",
    "itemname": "Corn Flakes Masala-L",
    "transactionType": "TransferIn",
    "netamount": 500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Plum Cake 250gm",
    "transactionType": "TransferIn",
    "netamount": 110
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Butterscotch Cake",
    "transactionType": "TransferIn",
    "netamount": 720
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Chocolate chips cake",
    "transactionType": "TransferIn",
    "netamount": 40000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Mango Delight Cake",
    "transactionType": "TransferIn",
    "netamount": 14000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Almond Honey Chocolate Cake",
    "transactionType": "TransferIn",
    "netamount": 500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Peach Cake",
    "transactionType": "TransferIn",
    "netamount": 5500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Black Forest Cake",
    "transactionType": "TransferIn",
    "netamount": 1000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Chocolate Crazy Boom",
    "transactionType": "TransferIn",
    "netamount": 2360
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Hot Chocolate Fudge",
    "transactionType": "TransferIn",
    "netamount": 2340
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Chocolate Sugar Free Ice-Cream",
    "transactionType": "TransferIn",
    "netamount": 1000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Kesar Badam Falooda",
    "transactionType": "TransferIn",
    "netamount": 4430
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Strawberry Ice-cream",
    "transactionType": "TransferIn",
    "netamount": 1231
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "TOP- Chocochips",
    "transactionType": "TransferIn",
    "netamount": 2200
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Cheese Cake Ice-Cream",
    "transactionType": "TransferIn",
    "netamount": 500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Sundae Large",
    "transactionType": "TransferIn",
    "netamount": 2350
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Mango Ice-cream",
    "transactionType": "TransferIn",
    "netamount": 8000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "TOP- Shooting Star",
    "transactionType": "TransferIn",
    "netamount": 2360
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Ice Blue Sundae",
    "transactionType": "TransferIn",
    "netamount": 2340
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Creamy Litchi Boom",
    "transactionType": "TransferIn",
    "netamount": 2200
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Cookies Ice-cream",
    "transactionType": "TransferIn",
    "netamount": 7000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "TOP- Wafer",
    "transactionType": "TransferIn",
    "netamount": 88000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Litchi cherry Sundae",
    "transactionType": "TransferIn",
    "netamount": 2440
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Peach Malaba",
    "transactionType": "TransferIn",
    "netamount": 2230
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Cherry Mania Ice-Cream",
    "transactionType": "TransferIn",
    "netamount": 2700
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "North Indian FG",
    "itemname": "Fruit Mixture",
    "transactionType": "TransferIn",
    "netamount": 324
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "NA",
    "itemname": "NA",
    "transactionType": "Sales",
    "netamount": 476426
  },
  {
    "outlet": "KOLAR",
    "brandname": "NA",
    "itemname": "NA",
    "transactionType": "Sales",
    "netamount": 115313
  },
  {
    "outlet": "MALLESHWARAM",
    "brandname": "NA",
    "itemname": "NA",
    "transactionType": "Sales",
    "netamount": 92141
  }
]
let formatData = function(data) {
  let brandnames = [];
  let itemnames = [];
  let outlets = [];
  data.forEach(element => {
    if (brandnames.indexOf(element.brandname) == -1 && (element.brandname) !== "NA") { //taking brandname which do not have bradname===NA
      brandnames.push(element.brandname);
    }
    if (itemnames.indexOf(element.itemname) == -1 && (element.itemname) !== "NA") { //taking itemname which do not have bradname===NA
      itemnames.push(element.itemname);
    }
    if (outlets.indexOf(element.outlet) == -1) {
      outlets.push(element.outlet);
    }
  });
  return {
    data: data,
    brandnames: brandnames,
    itemnames: itemnames,
    outlets: outlets,
  };
};
var totalSalesPercentage = '';
var olWiseSalesPercentage = '';
let renderTable = function(data) {
  brandnames = data.brandnames;
  itemnames = data.itemnames;
  outlets = data.outlets;
  data = data.data;
  let tbl = document.getElementById("ConsumptionTable");
  let table = document.createElement("table");
  let thead = document.createElement("thead");
  let headerRow = document.createElement("tr");
  let th = document.createElement("th");

  th = document.createElement("th");
  th.innerHTML = "Brand Name";
  th.classList.add("text-center");
  headerRow.appendChild(th);

  let grandTotal = 0;
  let grandNetAmount = 0;
  let outletWiseTotal = {};
  let outletWiseNetamount = {};
  th = document.createElement("th");
  th.colSpan = 2;
  th.innerHTML = "Total";
  th.classList.add("text-center");
  headerRow.appendChild(th);

  outlets.forEach(element => {

    th = document.createElement("th");
    th.colSpan = 2;
    th.innerHTML = element; // populating outlet 
    th.classList.add("text-center");
    headerRow.appendChild(th);
    outletWiseTotal[element] = 0;
    data.forEach(el => {
      if (el.outlet == element && el.brandname !== "NA") { //taking brandname which do not have bradname===NA
        outletWiseTotal[element] += parseInt(el.netamount); //here i am calculating the outletWiseTotal where transcationType==TransferIn

      }
      if (el.outlet == element && el.brandname == "NA" && el.transactionType == "Sales") { //taking brandname which do not have bradname===NA
        outletWiseNetamount[element] = parseInt(el.netamount) || 0


      }

    });
    console.log(outletWiseTotal)
    grandTotal += outletWiseTotal[element]; //then calculating grand total to populate it into  Total column at grn entery

    grandNetAmount += outletWiseNetamount[element] || 0

  });

  thead.appendChild(headerRow);
  headerRow = document.createElement("tr");
  th = document.createElement("th");
  th.innerHTML = "";
  headerRow.appendChild(th);

  for (i = 0; i < outlets.length + 1; i++) {
    th = document.createElement("th");
    th.innerHTML = "Sales";
    th.classList.add("text-center");
    headerRow.appendChild(th);

    th = document.createElement("th");
    th.innerHTML = "Grn Entery";
    th.classList.add("text-center");
    headerRow.appendChild(th);
  }

  headerRow.insertBefore(th, headerRow.children[1]);
  thead.appendChild(headerRow);
  table.appendChild(thead);

  headerRow = document.createElement("tr");
  td = document.createElement("th");
  td.innerHTML = "Total";
  td.classList.add("text-center");
  headerRow.appendChild(td);
  let el1 = 0;
  outlets.forEach(element => {

    td = document.createElement("th");
    td.innerHTML = outletWiseTotal[element].toLocaleString('en-IN');
    td.classList.add("text-right");
    headerRow.appendChild(td);
    if (element.outlet == element) {
      el1 = element.netAmount;
    }
    td = document.createElement("th");
    td.innerHTML = outletWiseNetamount[element].toLocaleString('en-IN') || 0;
    td.classList.add("text-right");
    headerRow.appendChild(td);

  });
  td = document.createElement("th");
  td.innerHTML = grandNetAmount.toLocaleString('en-IN');
  td.classList.add("text-right");
  headerRow.insertBefore(td, headerRow.children[1]);

  td = document.createElement("th");
  td.innerHTML = grandTotal.toLocaleString('en-IN');
  td.classList.add("text-right");
  headerRow.insertBefore(td, headerRow.children[1]);
  thead.appendChild(headerRow);
  table.appendChild(thead);

  let tbody = document.createElement("tbody");
  brandnames.forEach(element => {
    let row = document.createElement("tr");

    td = document.createElement("td");
    td.innerHTML = '<span onclick="expand(this)"><i class="fas fa-plus" id="test"></i>&nbsp</span>' + " " + element; //creating plus font icon to make click happen

    row.appendChild(td);
    let total = 0;
    let totalBCount = 0;
    outlets.forEach(outlet => {
      let el = 0;
      let bc = 0;
      data.forEach(d => {
        if (d.brandname == element && d.outlet == outlet) {
          total += parseInt(d.netamount);
          el = d.netamount;
          console.log(el) //this one is populating ful data here
        }
      });
      console.log(el) //but here it is not taking cumulative sum of netamount it is only taking one amount of each brand 
      olWiseSalesPercentage = (el / outletWiseTotal[outlet]) * 100 || 0 //here doing some calculations
      td = document.createElement("td");
      td.innerHTML = el.toLocaleString('en-IN');

      td.classList.add("text-right");
      row.appendChild(td);
      td = document.createElement("td");
      td.innerHTML = olWiseSalesPercentage.toFixed(2) + "%";

      td.classList.add("text-right");
      row.appendChild(td);
    });
    totalSalesPercentage = (total / grandTotal) * 100 //here doing some calculations
    const totalSalesPercentageFix = totalSalesPercentage.toFixed(2) + "%"
    td = document.createElement("td");
    td.innerHTML = totalSalesPercentageFix;
    td.classList.add("text-right");
    row.insertBefore(td, row.children[1]);

    td = document.createElement("td");
    td.innerHTML = total.toLocaleString('en-IN');
    td.classList.add("text-right");
    row.insertBefore(td, row.children[1]);
    tbody.appendChild(row);
  });
  table.appendChild(tbody);
  tbl.innerHTML = "";
  tbl.appendChild(table);
  table.classList.add("table");
  table.classList.add("table-striped");
  table.classList.add("table-bordered");
  table.classList.add("table-hover");

}
let formatedData = formatData(data);
renderTable(formatedData);

function expand(e) {
  let itemsRow = document.querySelectorAll('.itemsRow');
  if(itemsRow){
    itemsRow.forEach(v => v.style.display = 'none')
  }
    let list = e.parentNode.children;
    for (v of list){
      if(v.nodeName === 'TABLE'){
      v.style.display = '';
      return
    }
    }
 

  let brand = e.parentNode.innerHTML.substr(e.parentNode.innerHTML.lastIndexOf('>')+1).trim()
  let table = document.createElement("table");
  table.classList.add("itemsRow");
  let tbody = document.createElement("tbody");

  let brandNames = data.filter(v => v.brandname === brand)
  
  brandNames.forEach(element => {
    let row = document.createElement("tr");
    for (let property in element) {
          td = document.createElement("td"); 
          td.classList.add("items");
          td.innerHTML = element[property];
         row.appendChild(td)
  }

    tbody.appendChild(row)
  });
  table.appendChild(tbody);
  e.parentNode.appendChild(table);
}

#test {
  color: green;
  cursor: pointer;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="https://use.fontawesome.com/releases/v5.6.3/css/all.css">
<div align="center" class="table table-responsive">
  <table id="ConsumptionTable"></table>
</div>

codepen - https://codepen.io/nagasai/pen/pBMgYv

Answer 2

I suggest you use DataTables.

DataTables offers a rich API for rendering row data, show/hiding columns, search/filter, paging, etc. It can be styled through jQuery UI or Bootstrap, or your own branding. In contrast to writing up your own table display logic, the DataTables libraries are free to use and extremely flexible.

See: https://datatables.net/examples/api/row_details.html

Answer 3

Nearly a pure JavaScript solution example breaking up the parts for headers a bit into functions, functions for the detail rows where it looks up the header to put amounts under - I added an item to demonstrate that.

If you run this, you can expand the top notes to see detail notes of things I did. (click the big blue button)

/*jshint esversion: 6 */

var rawdata = [{
    "outlet": "JAYANAGAR",
    "brandname": "Bakery FG",
    "itemname": "Khara Boondhi-L",
    "transactionType": "TransferIn",
    "netamount": 980
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Bakery FG",
    "itemname": "Samosa-L",
    "transactionType": "TransferIn",
    "netamount": 130
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Bakery FG",
    "itemname": "Corn Flakes Masala-L",
    "transactionType": "TransferIn",
    "netamount": 500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Plum Cake 250gm",
    "transactionType": "TransferIn",
    "netamount": 110
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Butterscotch Cake",
    "transactionType": "TransferIn",
    "netamount": 720
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Chocolate chips cake",
    "transactionType": "TransferIn",
    "netamount": 40000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Mango Delight Cake",
    "transactionType": "TransferIn",
    "netamount": 14000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Almond Honey Chocolate Cake",
    "transactionType": "TransferIn",
    "netamount": 500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Peach Cake",
    "transactionType": "TransferIn",
    "netamount": 5500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Black Forest Cake",
    "transactionType": "TransferIn",
    "netamount": 1000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Chocolate Crazy Boom",
    "transactionType": "TransferIn",
    "netamount": 2360
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Hot Chocolate Fudge",
    "transactionType": "TransferIn",
    "netamount": 2340
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Chocolate Sugar Free Ice-Cream",
    "transactionType": "TransferIn",
    "netamount": 1000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Kesar Badam Falooda",
    "transactionType": "TransferIn",
    "netamount": 4430
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Strawberry Ice-cream",
    "transactionType": "TransferIn",
    "netamount": 1231
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "TOP- Chocochips",
    "transactionType": "TransferIn",
    "netamount": 2200
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Cheese Cake Ice-Cream",
    "transactionType": "TransferIn",
    "netamount": 500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Sundae Large",
    "transactionType": "TransferIn",
    "netamount": 2350
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Mango Ice-cream",
    "transactionType": "TransferIn",
    "netamount": 8000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "TOP- Shooting Star",
    "transactionType": "TransferIn",
    "netamount": 2360
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Ice Blue Sundae",
    "transactionType": "TransferIn",
    "netamount": 2340
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Creamy Litchi Boom",
    "transactionType": "TransferIn",
    "netamount": 2200
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Cookies Ice-cream",
    "transactionType": "TransferIn",
    "netamount": 7000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "TOP- Wafer",
    "transactionType": "TransferIn",
    "netamount": 88000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Litchi cherry Sundae",
    "transactionType": "TransferIn",
    "netamount": 2440
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Peach Malaba",
    "transactionType": "TransferIn",
    "netamount": 2230
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Cherry Mania Ice-Cream",
    "transactionType": "TransferIn",
    "netamount": 2700
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "North Indian FG",
    "itemname": "Fruit Mixture",
    "transactionType": "TransferIn",
    "netamount": 324
  },
  {
    "outlet": "MALLESHWARAM",
    "brandname": "My Pie",
    "itemname": "Cherry Pie",
    "transactionType": "TransferIn",
    "netamount": 324
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "NA",
    "itemname": "NA",
    "transactionType": "Sales",
    "netamount": 476426
  },
  {
    "outlet": "KOLAR",
    "brandname": "NA",
    "itemname": "NA",
    "transactionType": "Sales",
    "netamount": 115313
  },
  {
    "outlet": "MALLESHWARAM",
    "brandname": "NA",
    "itemname": "NA",
    "transactionType": "Sales",
    "netamount": 92141
  }
];

// basic functions, work even in old browsers like ie6
var myApp = myApp || {};
myApp.funcs = {
  indexOf: function(myArray, searchTerm, property) {
    for (var i = 0; i < myArray.length; i++) {
      if (myArray[i][property] === searchTerm) return i;
    }
    return -1;
  },
  indexAllOf: function(myArray, searchTerm, property) {
    var ai = [];
    for (var i = 0; i < myArray.length; i++) {
      if (myArray[i][property] === searchTerm) ai.push(i);
    }
    return ai;
  },
  lookup: function(myArray, searchTerm, property, firstOnly) {
    var found = [];
    var i = myArray.length;
    while (i--) {
      if (myArray[i][property] === searchTerm) {
        found.push(myArray[i]);
        if (firstOnly) break; //if only the first 
      }
    }
    return found;
  },
  exclude: function(myArray, searchTerm, property, firstOnly = false) {
    var found = [];
    var i = myArray.length;
    while (i--) {
      if (myArray[i][property] !== searchTerm) {
        found.push(myArray[i]);
        if (firstOnly) break; //if only the first 
      }
    }
    return found;
  },
  lookupAll: function(myArray, searchTerm, property) {
    return this.lookup(myArray, searchTerm, property, false);
  },
  arrSum: function(arr, selectorProp, selectorValue, numProp) {
    // get the summary (total) of any object array, assumes number
    function isSumMatch(item, index, arr) {
      return item[1][selectorProp] == selectorValue;
    }
    const arrSum = Object.entries(arr)
      .filter(isSumMatch)
      .map(item => item[1][numProp])
      .reduce((partial_sum, a) => partial_sum + a, 0);
    return arrSum;
  }
};
myApp.data = myApp.data || {
  items: rawdata
};
// could also do:
//myApp.data = myApp.data || {};
//myApp.data.items = myApp.data.items || rawdata;

// add a function, could be in above also
myApp.funcs.formatData = function(data) {
  let brandnames = [];
  let itemnames = [];
  let outlets = [];
  data.forEach(element => {
    //taking brandname which do not have bradname===NA
    if (brandnames.indexOf(element.brandname) == -1 && (element.brandname) !== "NA") {
      brandnames.push(element.brandname);
    }
    //taking itemname which do not have bradname===NA
    if (itemnames.indexOf(element.itemname) == -1 && (element.itemname) !== "NA") {
      itemnames.push(element.itemname);
    }
    if (outlets.indexOf(element.outlet) == -1) {
      outlets.push(element.outlet);
    }
  });
  return {
    //data: data,
    brandnames: brandnames,
    itemnames: itemnames,
    outlets: outlets,
  };
};

let renderHeader = function(data, targetTable) {
  let headId = targetTable.id + "-theadid";
  let thead = document.createElement("thead");
  thead.setAttribute("id", headId);
  let headerRow = document.createElement("tr");
  let headerInst = 0;
  let rowClass = headId + "-" + headerInst;
  headerRow.setAttribute("id", headId);
  headerRow.classList.add(rowClass);
  let th = document.createElement("th");
  // first header row
  th = document.createElement("th");
  th.innerHTML = "Brand Name";
  th.classList.add("text-center");
  headerRow.appendChild(th);

  th = document.createElement("th");
  th.colSpan = 2;
  th.innerHTML = "Total";
  th.classList.add("text-center");
  headerRow.appendChild(th);
  // first header row - outlets names
  data.formatedData.outlets.forEach(outlet => {
    th = document.createElement("th");
    th.colSpan = 2;
    th.setAttribute("data-outlet", outlet);
    th.innerHTML = outlet; // populating outlet 
    th.classList.add("text-center");
    headerRow.appendChild(th);
  });
  thead.appendChild(headerRow);

  /* entery header row */
  headerRow = document.createElement("tr");
  th = document.createElement("th");
  th.innerHTML = "";
  headerRow.appendChild(th);
  let i = 0;
  // entery header row
  for (i; i < data.formatedData.outlets.length + 1; i++) {
    th = document.createElement("th");
    th.innerHTML = "Sales";
    th.classList.add("text-center");
    headerRow.appendChild(th);

    th = document.createElement("th");
    th.innerHTML = "Grn Entery";
    th.classList.add("text-center");
    headerRow.appendChild(th);
  }
  thead.appendChild(headerRow);
  let oh = targetTable.getElementsByTagName('thead')[0];
  oh.parentNode.replaceChild(thead, oh);
  myApp.data.origHead = targetTable.getElementsByTagName('thead')[0];
  return headId;
};

let renderGrandTotal = function(data, targetTable, origHead) {
  let headerRow = document.createElement("tr");
  let th = document.createElement("th");
  th.innerHTML = "Total";
  th.classList.add("text-center");
  headerRow.appendChild(th);

  let el1 = 0;
  data.formatedData.outlets.forEach(element => {
    th = document.createElement("th");
    th.innerHTML = data.outletWiseTotal[element].toLocaleString('en-IN');
    th.classList.add("text-right");
    headerRow.appendChild(th);
    if (element.outlet == element) {
      el1 = element.netAmount;
    }
    th = document.createElement("th");
    th.innerHTML = data.outletWiseNetamount[element].toLocaleString('en-IN') || 0;
    th.classList.add("text-right");
    headerRow.appendChild(th);
  });
  th = document.createElement("th");
  th.innerHTML = data.grandNetAmount.toLocaleString('en-IN');
  th.classList.add("text-right");
  headerRow.insertBefore(th, headerRow.children[1]);

  th = document.createElement("th");
  th.innerHTML = data.grandTotal.toLocaleString('en-IN');
  th.classList.add("text-right");
  headerRow.insertBefore(th, headerRow.children[1]);
  origHead.appendChild(headerRow);
};
let getTotals = function(data) {
  data.outletWiseTotal = {};
  data.outletWiseNetamount = {};
  let na = "NA";
  let bn = "brandname";
  let num = 'netamount';
  let notJustOne = false;
  data.grandTotal = myApp.funcs.arrSum(myApp.funcs.exclude(data.items, na, bn, notJustOne), 'transactionType', 'TransferIn', num);
  data.grandNetAmount = myApp.funcs.arrSum(myApp.funcs.lookupAll(data.items, "NA", bn), 'transactionType', "Sales", num);
  data.formatedData.outlets.forEach(element => {
    data.outletWiseTotal[element] = 0;
    let myOutlet = myApp.funcs.lookupAll(data.items, element, "outlet");
    let notNA = myApp.funcs.exclude(myOutlet, na, bn);
    let justNA = myApp.funcs.lookupAll(myOutlet, na, bn);
    data.outletWiseTotal[element] = myApp.funcs.arrSum(notNA, 'outlet', element, num);
    data.outletWiseNetamount[element] = myApp.funcs.arrSum(justNA, 'transactionType', "Sales", num);
  });
  return data;
};

let findHeader = function(origHead, searchText) {
  let headers = origHead.getElementsByTagName("tr")[0]
    .getElementsByTagName("th");

  let found;
  let i = 0;
  for (i; i < headers.length; i++) {
    if (headers[i].dataset.outlet == searchText) {
      found = headers[i];
      break;
    }
  }

  return {
    head: headers,
    index: i,
    outletHeader: found
  };
};

function getHeadByCell(headerRow, cell) {
  var idx = $(cell).index(),
    th,
    th_colSpan = 0;
  let i = 0;
  for (i; i < headerRow.cells.length; i++) {
    th = headerRow.cells[i];
    th_colSpan += th.colSpan;
    let isThing = (th_colSpan >= (idx + cell.colSpan));
    if (th_colSpan >= (idx + cell.colSpan)) {
      break;
    }
  }
  return th;
}

let renderBrandDetailRow = function(rowdata, tblBody, brandname, brandClass) {
  // render stuff like Bakery FG
  let r = 0;
  for (r; r < rowdata.length; r++) {
    let row = document.createElement("tr");
    row.classList.add("collapse", brandClass);
    let td = document.createElement("td");
    td.classList.add("text-center");
    td.innerHTML = brandname;
    row.appendChild(td);
    // item name
    td = document.createElement("td");
    td.classList.add("text-center");
    td.colSpan = 2;
    td.innerHTML = rowdata[r]["itemname"];
    row.appendChild(td);
    // punch in empty column data first
    let groupOutletsCount = myApp.data.formatedData.outlets.length;
    for (let c = 0; c < (groupOutletsCount * 2); c++) {
      td = document.createElement("td");
      td.classList.add("text-right");
      row.appendChild(td);
    }
    let origHead = myApp.data.origHead;
    let found = findHeader(origHead, rowdata[r].outlet);
    let testRow = origHead.getElementsByTagName("tr")[1];
    let fr = 0;
    for (fr; fr < testRow.getElementsByTagName("th").length; fr++) {
      let mycell = testRow.getElementsByTagName("th")[fr];
      let ath = getHeadByCell(origHead.getElementsByTagName("tr")[0], mycell);
      if (ath == found.outletHeader) break;
    }
    // now we have the header that matches, put the data in the right place
    row.getElementsByTagName("td")[fr].innerHTML = rowdata[r]["netamount"].toLocaleString('en-IN');
    tblBody.appendChild(row);
  }
};
let renderTable = function(data) {
  let tbl = document.getElementById("ConsumptionTable");
  tbl.classList.add("table", "table-striped", "table-bordered", "table-hover");
  let headId = renderHeader(data, tbl);
  let origHead = document.getElementById(headId);
  let tbody = document.createElement("tbody");

  let headerInst = 0;
  let rowClass = headId + "-" + headerInst;
  renderGrandTotal(data, tbl, origHead);
  let collapseClass = 0;
  data.formatedData.brandnames.forEach(element => {
    let brandSum = myApp.funcs.arrSum(data.items, 'brandname', element, "netamount");
    let row = document.createElement("tr");
    let td = document.createElement("td");
    let brandClass = "multi-collapse-" + collapseClass;
    td.innerHTML = '<span><i class="fas fa-plus expand-child-group" data-toggle="collapse" data-target="' + '.' + brandClass + '"></i>&nbsp</span> ' + element;
    row.appendChild(td);
    data.formatedData.outlets.forEach(outlet => {
      let outletSum = myApp.funcs.arrSum(myApp.data.items, 'outlet', outlet, 'netamount');
      data.olWiseSalesPercentage = (brandSum / outletSum) * 100 || 0;
      td = document.createElement("td");
      td.innerHTML = brandSum.toLocaleString('en-IN');
      td.classList.add("text-right");
      row.appendChild(td);
      td = document.createElement("td");
      td.innerHTML = data.olWiseSalesPercentage.toFixed(2) + "%";
      td.classList.add("text-right");
      row.appendChild(td);
    });
    data.totalSalesPercentage = (brandSum / data.grandTotal) * 100;
    const totalSalesPercentageFix = data.totalSalesPercentage.toFixed(2) + "%";
    td = document.createElement("td");
    td.innerHTML = totalSalesPercentageFix;
    td.classList.add("text-right");
    row.insertBefore(td, row.children[1]);

    td = document.createElement("td");
    td.innerHTML = brandSum.toLocaleString('en-IN');
    td.classList.add("text-right");
    row.insertBefore(td, row.children[1]);
    tbody.appendChild(row);
    let brandData = myApp.funcs.lookupAll(myApp.data.items, element, 'brandname');
    renderBrandDetailRow(brandData, tbody, element, brandClass);
    collapseClass++;
  });
  tbl.appendChild(tbody);
};

$('#things-i-did').find('.list-group').toggleClass('hidden', true);
myApp.data.formatedData = myApp.funcs.formatData(myApp.data.items);
getTotals(myApp.data);
renderTable(myApp.data);

let cttbl = document.getElementById('ConsumptionTable');
cttbl.addEventListener('click', function(event) {
  let myExp = "expand-child-group";// detail row class
  if (event.target.classList.contains(myExp)) {
    let myAttr = event.target.dataset.target;
    //console.log(myAttr);
  }
}, false);

.expand-child-group {
  color: green;
  cursor: pointer;
}

.identify-me {
  background-color: lime;
}

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="https://use.fontawesome.com/releases/v5.6.3/css/all.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.bundle.min.js"></script>

<div id="things-i-did">
  <h5>Things I did: <button class="btn btn-primary btn-sm" type="button" data-toggle="collapse" data-target="#collapseChanges" aria-expanded="false" aria-controls="collapseChanges">
    Toggle changes visible
  </button></h5>
  <div id="collapseChanges" class="collapse">
    <ul class="list-group">
      <li class="list-group-item">Added this silly toggle list</li>
      <li class="list-group-item">Added a lot of missing semi-colons</li>
      <li class="list-group-item">Remove obvious comments "do calculation"</li>
      <li class="list-group-item">Consolidate the: <code>td.classlist.add("my-class");
td.classlist.add("my-other-class");</code> to an array/list: <code>td.classlist.add("my-class","my-other-class");</code></li>
      <li class="list-group-item">Several "undefined" variables used, removed or defined with <code>let mything =</code></li>
      <li class="list-group-item">Clarify several variables used</li>
      <li class="list-group-item">Remove several "unused" variables</li>
      <li class="list-group-item">added base to parseInt functions</li>
      <li class="list-group-item">Used Event listener for click <code>cttbl.addEventListener('click', function(event) {</code></li>
      <li class="list-group-item">change <code>td = something</code> to <code>th = something</code> variable to clarify intent</li>
      <li class="list-group-item">Removed <code>id="test"</code>, duplicate ID's are invalid</li>
      <li class="list-group-item">Created an object <code>var myApp = myApp || {};</code> to hold all the stuff <i>(function, calculation data, globals)</i> and avoid global variables</li>
      <li class="list-group-item">functions for each detail row under proper header</li>
    </ul>
  </div>
</div>
<div align="center" class="table table-responsive">
  <table id="ConsumptionTable">
    <thead></thead>
  </table>
</div>

Answer 4

Pass "the row was clicked" or "the row we want to add some rows after" to the expand function

td.addEventListener('click', function(){
    expand(row);
});

Then just expand new rows using:

function insertAfter(elm, newElm) {
    elm.parentNode.insertBefore(newElm, elm.nextSibling);
}

Sample code down below:

function format(number, decimals = 2, locale = 'en-in') {
  const fixed = parseInt(number).toFixed(decimals);
  const [int, dec] = fixed.split('.')
  const intFormatted = (+int).toLocaleString(locale)
  return intFormatted + (dec ? '.' + dec : '');
}
var data = [{
    "outlet": "JAYANAGAR",
    "brandname": "Bakery FG",
    "itemname": "Khara Boondhi-L",
    "transactionType": "TransferIn",
    "netamount": 980
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Bakery FG",
    "itemname": "Samosa-L",
    "transactionType": "TransferIn",
    "netamount": 130
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Bakery FG",
    "itemname": "Corn Flakes Masala-L",
    "transactionType": "TransferIn",
    "netamount": 500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Plum Cake 250gm",
    "transactionType": "TransferIn",
    "netamount": 110
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Butterscotch Cake",
    "transactionType": "TransferIn",
    "netamount": 720
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Chocolate chips cake",
    "transactionType": "TransferIn",
    "netamount": 40000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Mango Delight Cake",
    "transactionType": "TransferIn",
    "netamount": 14000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Almond Honey Chocolate Cake",
    "transactionType": "TransferIn",
    "netamount": 500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Peach Cake",
    "transactionType": "TransferIn",
    "netamount": 5500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Black Forest Cake",
    "transactionType": "TransferIn",
    "netamount": 1000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Chocolate Crazy Boom",
    "transactionType": "TransferIn",
    "netamount": 2360
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Hot Chocolate Fudge",
    "transactionType": "TransferIn",
    "netamount": 2340
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Chocolate Sugar Free Ice-Cream",
    "transactionType": "TransferIn",
    "netamount": 1000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Kesar Badam Falooda",
    "transactionType": "TransferIn",
    "netamount": 4430
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Strawberry Ice-cream",
    "transactionType": "TransferIn",
    "netamount": 1231
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "TOP- Chocochips",
    "transactionType": "TransferIn",
    "netamount": 2200
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Cheese Cake Ice-Cream",
    "transactionType": "TransferIn",
    "netamount": 500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Sundae Large",
    "transactionType": "TransferIn",
    "netamount": 2350
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Mango Ice-cream",
    "transactionType": "TransferIn",
    "netamount": 8000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "TOP- Shooting Star",
    "transactionType": "TransferIn",
    "netamount": 2360
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Ice Blue Sundae",
    "transactionType": "TransferIn",
    "netamount": 2340
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Creamy Litchi Boom",
    "transactionType": "TransferIn",
    "netamount": 2200
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Cookies Ice-cream",
    "transactionType": "TransferIn",
    "netamount": 7000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "TOP- Wafer",
    "transactionType": "TransferIn",
    "netamount": 88000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Litchi cherry Sundae",
    "transactionType": "TransferIn",
    "netamount": 2440
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Peach Malaba",
    "transactionType": "TransferIn",
    "netamount": 2230
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Cherry Mania Ice-Cream",
    "transactionType": "TransferIn",
    "netamount": 2700
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "North Indian FG",
    "itemname": "Fruit Mixture",
    "transactionType": "TransferIn",
    "netamount": 324
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "NA",
    "itemname": "NA",
    "transactionType": "Sales",
    "netamount": 476426
  },
  {
    "outlet": "KOLAR",
    "brandname": "NA",
    "itemname": "NA",
    "transactionType": "Sales",
    "netamount": 115313
  },
  {
    "outlet": "MALLESHWARAM",
    "brandname": "NA",
    "itemname": "NA",
    "transactionType": "Sales",
    "netamount": 92141
  }
]
let formatData = function(data) {
  let brandnames = [];
  let itemnames = [];
  let outlets = [];
  data.forEach(element => {
    if (brandnames.indexOf(element.brandname) == -1 && (element.brandname) !== "NA") { //taking brandname which do not have bradname===NA
      brandnames.push(element.brandname);
    }
    if (itemnames.indexOf(element.itemname) == -1 && (element.itemname) !== "NA") { //taking itemname which do not have bradname===NA
      itemnames.push(element.itemname);
    }
    if (outlets.indexOf(element.outlet) == -1) {
      outlets.push(element.outlet);
    }
  });
  return {
    data: data,
    brandnames: brandnames,
    itemnames: itemnames,
    outlets: outlets,
  };
};
var totalSalesPercentage = '';
var olWiseSalesPercentage = '';
let renderTable = function(data) {
  brandnames = data.brandnames;
  itemnames = data.itemnames;
  outlets = data.outlets;
  data = data.data;
  let tbl = document.getElementById("ConsumptionTable");
  let table = document.createElement("table");
  let thead = document.createElement("thead");
  let headerRow = document.createElement("tr");
  let th = document.createElement("th");

  th = document.createElement("th");
  th.innerHTML = "Brand Name";
  th.classList.add("text-center");
  headerRow.appendChild(th);

  let grandTotal = 0;
  let grandNetAmount = 0;
  let outletWiseTotal = {};
  let outletWiseNetamount = {};
  th = document.createElement("th");
  th.colSpan = 2;
  th.innerHTML = "Total";
  th.classList.add("text-center");
  headerRow.appendChild(th);

  outlets.forEach(element => {

    th = document.createElement("th");
    th.colSpan = 2;
    th.innerHTML = element; // populating outlet 
    th.classList.add("text-center");
    headerRow.appendChild(th);
    outletWiseTotal[element] = 0;
    data.forEach(el => {
      if (el.outlet == element && el.brandname !== "NA") { //taking brandname which do not have bradname===NA
        outletWiseTotal[element] += parseInt(el.netamount); //here i am calculating the outletWiseTotal where transcationType==TransferIn

      }
      if (el.outlet == element && el.brandname == "NA" && el.transactionType == "Sales") { //taking brandname which do not have bradname===NA
        outletWiseNetamount[element] = parseInt(el.netamount) || 0


      }

    });
    grandTotal += outletWiseTotal[element]; //then calculating grand total to populate it into  Total column at grn entery

    grandNetAmount += outletWiseNetamount[element] || 0

  });

  thead.appendChild(headerRow);
  headerRow = document.createElement("tr");
  th = document.createElement("th");
  th.innerHTML = "";
  headerRow.appendChild(th);

  for (i = 0; i < outlets.length + 1; i++) {
    th = document.createElement("th");
    th.innerHTML = "Sales";
    th.classList.add("text-center");
    headerRow.appendChild(th);

    th = document.createElement("th");
    th.innerHTML = "Grn Entery";
    th.classList.add("text-center");
    headerRow.appendChild(th);
  }

  headerRow.insertBefore(th, headerRow.children[1]);
  thead.appendChild(headerRow);
  table.appendChild(thead);

  headerRow = document.createElement("tr");
  td = document.createElement("th");
  td.innerHTML = "Total";
  td.classList.add("text-center");
  headerRow.appendChild(td);
  let el1 = 0;
  outlets.forEach(element => {

    td = document.createElement("th");
    td.innerHTML = outletWiseTotal[element].toLocaleString('en-IN');
    td.classList.add("text-right");
    headerRow.appendChild(td);
    if (element.outlet == element) {
      el1 = element.netAmount;
    }
    td = document.createElement("th");
    td.innerHTML = outletWiseNetamount[element].toLocaleString('en-IN') || 0;
    td.classList.add("text-right");
    headerRow.appendChild(td);

  });
  td = document.createElement("th");
  td.innerHTML = grandNetAmount.toLocaleString('en-IN');
  td.classList.add("text-right");
  headerRow.insertBefore(td, headerRow.children[1]);

  td = document.createElement("th");
  td.innerHTML = grandTotal.toLocaleString('en-IN');
  td.classList.add("text-right");
  headerRow.insertBefore(td, headerRow.children[1]);
  thead.appendChild(headerRow);
  table.appendChild(thead);

  let tbody = document.createElement("tbody");
  brandnames.forEach(element => {
    let row = document.createElement("tr");

    td = document.createElement("td");
    td.innerHTML = '<span><i class="fas fa-plus" id="test"></i>&nbsp</span>' + " " + element; //creating plus font icon to make click happen
    
    /*  
     * Pass the row was clicked to the expand function
     */
    td.addEventListener('click', function(){
      expand(row);
    });

    row.appendChild(td);
    let total = 0;
    let totalBCount = 0;
    outlets.forEach(outlet => {
      let el = 0;
      let bc = 0;
      data.forEach(d => {
        if (d.brandname == element && d.outlet == outlet) {
          total += parseInt(d.netamount);
          el = d.netamount;
          console.log(el) //this one is populating ful data here
        }
      });
      console.log(el) //but here it is not taking cumulative sum of netamount it is only taking one amount of each brand 
      olWiseSalesPercentage = (el / outletWiseTotal[outlet]) * 100 || 0 //here doing some calculations
      td = document.createElement("td");
      td.innerHTML = el.toLocaleString('en-IN');

      td.classList.add("text-right");
      row.appendChild(td);
      td = document.createElement("td");
      td.innerHTML = olWiseSalesPercentage.toFixed(2) + "%";

      td.classList.add("text-right");
      row.appendChild(td);
    });
    totalSalesPercentage = (total / grandTotal) * 100 //here doing some calculations
    const totalSalesPercentageFix = totalSalesPercentage.toFixed(2) + "%"
    td = document.createElement("td");
    td.innerHTML = totalSalesPercentageFix;
    td.classList.add("text-right");
    row.insertBefore(td, row.children[1]);

    td = document.createElement("td");
    td.innerHTML = total.toLocaleString('en-IN');
    td.classList.add("text-right");
    row.insertBefore(td, row.children[1]);
    tbody.appendChild(row);
  });
  table.appendChild(tbody);
  tbl.innerHTML = "";
  tbl.appendChild(table);
  table.classList.add("table");
  table.classList.add("table-striped");
  table.classList.add("table-bordered");
  table.classList.add("table-hover");

}
let formatedData = formatData(data);
renderTable(formatedData);

/*  
 * Insert newElm after elm
 */
function insertAfter(elm, newElm) {
  elm.parentNode.insertBefore(newElm, elm.nextSibling);
}

/*  
 * Add detail row after clicked row
 */
function expand(row) {
    let detailRow = document.createElement("tr");
    let td = document.createElement("td");
    td.colSpan = 9;
    td.innerHTML = "Detail row goes here";
    detailRow.appendChild(td);
    insertAfter(row, detailRow);
}

#test {
  color: green;
  cursor: pointer;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="https://use.fontawesome.com/releases/v5.6.3/css/all.css">
<div align="center" class="table table-responsive">
  <table id="ConsumptionTable"></table>
</div>

Answer 5

Do it this way, follow DRY and modular structure to keep it more readable and maintainable.

class CellEntry {
  constructor() {
    this.sum = 0;
    this.percentage = 0;
  }
}

class OutletBasedRowEntry {
  constructor() {
    this.cells = {
      Total: new CellEntry()
    };
    this.childRows = {};
  }
  add(entry) {
    this.cells.Total.sum += entry.netamount;
    this.getOrCreateCellById(entry.outlet).sum += entry.netamount;
  }
  getOrCreateChildRowById(id) {
    if (!this.childRows[id]) this.childRows[id] = new OutletBasedRowEntry();
    return this.childRows[id];
  }
  getOrCreateCellById(id) {
    if (!this.cells[id]) this.cells[id] = new CellEntry();
    return this.cells[id];
  }
}

function tabulizeData(data) {
  let TotalRowEntry = new OutletBasedRowEntry();
  data.forEach(entry => {
    TotalRowEntry.add(entry);
    TotalRowEntry.getOrCreateChildRowById(entry.brandname).add(entry);
    TotalRowEntry.getOrCreateChildRowById(entry.brandname).getOrCreateChildRowById(entry.itemname).add(entry);
  });
  renderTable(TotalRowEntry);
}

function renderTable(TotalRowEntry) {
  let $table = $('#ConsumptionTable');
  let $thead = $('<thead><tr><th>Brand Name</th></tr><tr><th></th></tr><tr><th>Total</th></tr><thead>'),
    $tbody = $('<tbody>');
  let $headingRows = $thead.find('tr');

  function addCellEntriesToRow(rowEntry, $row) {
    for (let cellName in TotalRowEntry.cells) {
      let cellEntry = rowEntry.getOrCreateCellById(cellName);
      $('<td>').html(cellEntry.sum).appendTo($row);
      $('<td>').html(cellEntry.percentage).appendTo($row);
    }
  }

  $.each(TotalRowEntry.cells, function(cellName, cellEntry) {
    $('<th colspan=2>').html(cellName).appendTo($headingRows.eq(0));
    $('<th>Grn Entery</th>').appendTo($headingRows.eq(1));
    $('<th>Sales</th>').appendTo($headingRows.eq(1));
    $('<th>').html(cellEntry.sum).appendTo($headingRows.eq(2));
    $('<th>').html(cellEntry.percentage).appendTo($headingRows.eq(2));
  });

  $.each(TotalRowEntry.childRows, function(brandName, rowEntry) {
    let $row = $('<tr>').appendTo($tbody);
    let rowId = 'row' + $row.index();
    let firstCell = $('<td><i class="fas fa-plus add-btn" data-toggle="collapse" data-target=".' + rowId + '"></i>' + brandName + '</td>').appendTo($row);
    addCellEntriesToRow(rowEntry, $row);
    $.each(rowEntry.childRows, function(itemName, rowEntry) {
      $row = $('<tr>').addClass('collapse ' + rowId).appendTo($tbody);
      $('<td>').html(itemName).appendTo($row);
      addCellEntriesToRow(rowEntry, $row);
    });
  });

  $thead.appendTo($table);
  $tbody.appendTo($table);
}

tabulizeData([{
    "outlet": "JAYANAGAR",
    "brandname": "Bakery FG",
    "itemname": "Khara Boondhi-L",
    "transactionType": "TransferIn",
    "netamount": 980
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Bakery FG",
    "itemname": "Samosa-L",
    "transactionType": "TransferIn",
    "netamount": 130
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Bakery FG",
    "itemname": "Corn Flakes Masala-L",
    "transactionType": "TransferIn",
    "netamount": 500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Plum Cake 250gm",
    "transactionType": "TransferIn",
    "netamount": 110
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Butterscotch Cake",
    "transactionType": "TransferIn",
    "netamount": 720
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Chocolate chips cake",
    "transactionType": "TransferIn",
    "netamount": 40000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Mango Delight Cake",
    "transactionType": "TransferIn",
    "netamount": 14000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Almond Honey Chocolate Cake",
    "transactionType": "TransferIn",
    "netamount": 500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Peach Cake",
    "transactionType": "TransferIn",
    "netamount": 5500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Black Forest Cake",
    "transactionType": "TransferIn",
    "netamount": 1000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Chocolate Crazy Boom",
    "transactionType": "TransferIn",
    "netamount": 2360
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Hot Chocolate Fudge",
    "transactionType": "TransferIn",
    "netamount": 2340
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Chocolate Sugar Free Ice-Cream",
    "transactionType": "TransferIn",
    "netamount": 1000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Kesar Badam Falooda",
    "transactionType": "TransferIn",
    "netamount": 4430
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Strawberry Ice-cream",
    "transactionType": "TransferIn",
    "netamount": 1231
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "TOP- Chocochips",
    "transactionType": "TransferIn",
    "netamount": 2200
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Cheese Cake Ice-Cream",
    "transactionType": "TransferIn",
    "netamount": 500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Sundae Large",
    "transactionType": "TransferIn",
    "netamount": 2350
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Mango Ice-cream",
    "transactionType": "TransferIn",
    "netamount": 8000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "TOP- Shooting Star",
    "transactionType": "TransferIn",
    "netamount": 2360
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Ice Blue Sundae",
    "transactionType": "TransferIn",
    "netamount": 2340
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Creamy Litchi Boom",
    "transactionType": "TransferIn",
    "netamount": 2200
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Cookies Ice-cream",
    "transactionType": "TransferIn",
    "netamount": 7000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "TOP- Wafer",
    "transactionType": "TransferIn",
    "netamount": 88000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Litchi cherry Sundae",
    "transactionType": "TransferIn",
    "netamount": 2440
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Peach Malaba",
    "transactionType": "TransferIn",
    "netamount": 2230
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Cherry Mania Ice-Cream",
    "transactionType": "TransferIn",
    "netamount": 2700
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "North Indian FG",
    "itemname": "Fruit Mixture",
    "transactionType": "TransferIn",
    "netamount": 324
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "NA",
    "itemname": "NA",
    "transactionType": "Sales",
    "netamount": 476426
  },
  {
    "outlet": "KOLAR",
    "brandname": "NA",
    "itemname": "NA",
    "transactionType": "Sales",
    "netamount": 115313
  },
  {
    "outlet": "MALLESHWARAM",
    "brandname": "NA",
    "itemname": "NA",
    "transactionType": "Sales",
    "netamount": 92141
  }
]);

.add-btn {
  color: green;
  cursor: pointer;
  margin-right: 6px;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="https://use.fontawesome.com/releases/v5.6.3/css/all.css">
<div align="center" class="table table-responsive">
  <table id="ConsumptionTable" class="table table-responsive table-hover table-bordered"></table>
</div>

Answer 6

Please check the following solution using the DataTables.

https://codepen.io/nbaua/pen/WBNQVE

HTML

<div style="margin:20px">
<table id="example" class="display" style="width:80%">
        <thead>
            <tr>
                <th></th>
                <th>Outlet</th>
                <th>Brand Name</th>
                <th>Item Name</th>
                <th>Transaction Type</th>
                <th>Net Amount</th>
            </tr>
        </thead>

    </table></div>

CSS

td.details-control {
  width:32px;
  height:32px;
    background: url('https://image.flaticon.com/icons/png/24/149/149145.png') no-repeat center center;
    cursor: pointer;
}
tr.shown td.details-control {
  width:32px;
  height:32px;
    background: url('https://image.flaticon.com/icons/png/24/149/149147.png') no-repeat center center;
}

JAVASCRIPT

    function format ( d ) {
    // `d` is the original data object for the row
  //create the tamplate as per your wish
    return '<table cellpadding="5" cellspacing="0" border="0" style="padding-left:50px;">'+
        '<tr>'+
            '<td>Outlet:</td>'+
            '<td>'+d.outlet +'</td>'+
        '</tr>'+
        '<tr>'+
            '<td>Brand Name:</td>'+
            '<td>'+d.brandname +'</td>'+
        '</tr>'+
        '<tr>'+
            '<td>Transaction Type:</td>'+
            '<td>And any further details here...</td>'+
        '</tr>'+
    '</table>';
}
var groupColumn = 2; //Group by column index
$(document).ready(function() {
    var table = $('#example').DataTable( {

      "drawCallback": function ( settings ) {
            var api = this.api();
            var rows = api.rows( {page:'current'} ).nodes();
            var last=null;

            api.column(groupColumn, {page:'current'} ).data().each( function ( group, i ) {
                if ( last !== group ) {
                    $(rows).eq( i ).before(
                        '<tr class="group"><td colspan="5"><h3>'+group+'</h3></td></tr>'
                    );

                    last = group;
                }
            } );
        },

        "data": [{
    "outlet": "JAYANAGAR",
    "brandname": "Bakery FG",
    "itemname": "Khara Boondhi-L",
    "transactionType": "TransferIn",
    "netamount": 980
  },
  ....... 1000 OTHER ITEMS 
  {
    "outlet": "MALLESHWARAM",
    "brandname": "NA",
    "itemname": "NA",
    "transactionType": "Sales",
    "netamount": 92141
  }
],
        "columns": [
            {
                "className":      'details-control',
                "data":           null,
                "defaultContent": ''
            },
            { "data": "outlet" }, //simply remove this columns if you don't require them in outer row
            //{ "data": "brandname" },
            { "data": "itemname" },
            { "data": "transactionType" },
            { "data": "netamount" }
        ],
        "order": [[1, 'asc']]
    } );

    // Add event listener for opening and closing details
    $('#example tbody').on('click', 'td.details-control', function () {
        var tr = $(this).closest('tr');
        var row = table.row( tr );

        if ( row.child.isShown() ) {
            // This row is already open - close it
            row.child.hide();
            tr.removeClass('shown');
        }
        else {
            // Open this row
            row.child( format(row.data()) ).show();
            tr.addClass('shown');
        }
    } );
} );