If the field in the source data contains blank cells, or cells with
text, you won't be able to group the data. There are some suggestions
here for fixing the problem:
http://www.contextures.com/xlPivot07.html#Problems
Forrest wrote:
I need to group the data in a pivot table, why will it not allow me to?
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Debra Dalgleish
Excel FAQ, Tips & Book List
http://www.contextures.com/tiptech.html