In MS Excel, what does the Subtotal command on the Data tab do?
Answer: D
Correct answer: Inserts summary rows into a sorted list at each change of a chosen column
The Subtotal command inserts summary rows into a list wherever a chosen column changes value - a total for each region, department or month - together with a grand total, and adds outline controls so the detail can be collapsed. Its one prerequisite is that the list must first be sorted by the column being grouped on. Applied to unsorted data it produces a subtotal at every change of value, which may be dozens of meaningless groups. That step is where most difficulty with the feature arises. The rows it inserts use the SUBTOTAL function rather than SUM, which is what allows nested subtotals to avoid double counting and makes the totals respect any filter applied afterwards. The outline numbers at the left collapse the view to totals alone, which is useful for printing a summary. Subtotals are removed with the Remove All button in the same dialogue. For anything more elaborate, a pivot table is the better tool.
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