> Can I do something like:
> -mywarehouseserver/temp/*/*
> +mywarehouseserver/temp/*/*.pdf
> +mywarehouseserver/temp/*/*.DOC
> +mywarehouseserver/temp/*/*.PPT

Yes this should do the trick.

You could even do
-*
+mywarehouseserver/temp/*/*.pdf
+mywarehouseserver/temp/*/*.doc
+mywarehouseserver/temp/*/*.ppt

(note: filters are case insensitive)