To add a custom menu to your Google spreadsheet, that when clicked, will list all your functions. See the code below
function onOpen() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var menubuttons = [ {name: "Clear B7-G7", functionName: "clearRange1"},
{name: "Clear B13-G13", functionName: "clearRange2"}];
ss.addMenu("Custom", menubuttons);
} // note you also have to have functions called clearRange1 and clearRange2 as list below
function clearRange1() { //replace 'Sheet1' with your actual sheet name
var sheet = SpreadsheetApp.getActive().getSheetByName('Sheet1');
sheet.getRange('B7:G7').clearContent();
}
function clearRange2() { //replace 'Sheet1' with your actual sheet name
var sheet = SpreadsheetApp.getActive().getSheetByName('Sheet1');
sheet.getRange('B13:G13').clearContent();
}