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Different Product template for different categories
One possible way is to use the layout update in the Design tab of the Manage Products in the backend. Once you set it up, you may then duplicate the product or export it and import it back after you add all the products in Excel.
that is not really any good. This is for a client who will be adding products themselves without any programming knowledge or knowledge of XML, XHTML or anything! So the products when added to a specific category need to pickup the correct template automatically