You can reverse the order, but other than that, you'd need to reorder the
data in the data sheet.
PPT's graphing just doesn't have the flexibility Excel's does. But PPT 2007
will use Excel to create its charts, which will alleviate this issue.

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Echo [MS PPT MVP] http://www.echosvoice.com
What's new in PPT 2007? http://www.echosvoice.com/2007.htm
Fixing PowerPoint Annoyances http://www.oreilly.com/catalog/powerpointannoy/
> Is there a way of changing data series order in a (let's say) bar chart in
> powerpoint, other than changing the order in the data table?
> This can be done in excel, but as far as I can see not with graphs built
> with MS Graph such as those in powerpoint.
> Thanks anybody