mcap,
You could make two shows and hyperlink between them. That way the viewer
would not notice. Other than that number them manually as you said yoursefl
that is a pain.
Also have a look at another thread from a few days ago called Page numbers
in PowerPoint from the 26th of this month. John Wilson kindly posted some
code that will do what you want in VBA.

Signature
Luc Sanders
(MVP - PowerPoint)
>I would like to automatically adjust the slide numbers so that the
> third slide of the presentation is labeled slide #1. My companies
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>
> Any help would be appreciated.