I have several pivot tables in a spreadsheet. There is a primary pivot table
called "Main" and many secondary Tables which use the Main table as the
source.

The data in Main keeps changing from week to week. However, I find that in
pivot table drop downs there are values which do not exist in the current
sheet. These values were there in the last week's data but not in this
week's. Though they appear in the drop down, they dont appear in the table.

Any idea as to why this is happening? How can I purge old data from the
Pivot tables?

Thanks
Eshwar