You might have to make changes to a workbook that contains a pivot table. If someone else created that workbook, you may not be sure where to find the Excel table that was used as the pivot table’s source data. In some workbooks there can be several Excel tables, and it’s not immediately obvious which [...]

In Excel 2007, you added a date field to the pivot table’s Row area, and you want to group the dates by year. However, you get an error message, “Cannot group that selection”, when you try to group the dates.
This error occurs if there are cells in the source data that contain text, instead of [...]