Almost every month, I suggest the Subtotal feature to a reader. It's an easy-to-use feature that summarizes data by groups. You define the group and the summarizing function; Excel does the rest ...

Adding a condition to a simple revenue sheet might spell trouble in Microsoft Excel, but don't worry--a simple conditional function can handle the request.

There are several reasons to use SUBTOTAL instead of SUM when inserting subtotals in your spreadsheet.