Do you mean you need to have slides with different templates in the same PPT
file? If so, this is easy to do in PPT 2002 and 2003, but not in 2000 or 97.
See http://www.echosvoice.com/multipletemplates.htm for some ideas.

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Echo [MS PPT MVP] http://www.echosvoice.com
Fixing PowerPoint Annoyances http://www.oreilly.com/catalog/powerpointannoy/
PPTLive! Sept 17-20, 2006 http://www.pptlive.com
>i want to keep 2 or more ppts in one slide or in another presentation which
> is not allowed at present. How to do that?
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>
> http://www.microsoft.com/office/community/en-us/default.mspx?mid=76745cec-6633-4
908-b8db-3074796f332e&dg=microsoft.public.powerpoint