This is a known problem in Excel 2000. There's some info in the
following MSKB article, which suggests recording a macro as you apply
the formatting:
XL2000: Changing a PivotChart Removes Series Formatting
http://support.microsoft.com/?id=215904
> How can I keep the properties in a pivot chart, like the
> color of the graphic, after I choose other option on the
> chart?

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Debra Dalgleish
Excel FAQ, Tips & Book List
http://www.contextures.com/tiptech.html