I created a Pivot Table and want to display only the Top 20% of Customers.

I go to the Pivot Table Field List and open the filtering drop-down list for
a field. Then I select "Value Filters". But the only filtering option
available is "Top 10"; all other filtering options are grayed out. If I want
to filter by a certain range of values, I can't.

Then, when I select "Top 10", I can only filter by Item; Percent and Sum
don't appear in the drop-down list. Any ideas?
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BernieG