Excel - Sum column if condition is met by checking other column in same table

Question

I am trying to create spreadsheet to use in a small retail shop.

I have a workbook which contains expenses figures on a sheet and income figure on another sheet.

Answer 1

Actually a more refined solution is use the build-in function sumif, this function does exactly what you need, will only sum those expenses of a specified month.

example

=SUMIF(A2:A100,"=January",B2:B100)