If you want to create one ad per page, then simply use a unique sub category name for each product ad.

For example, if you have 1,000 product ads, then assign 1,000 individual sub categories titles. In this particular case, the main category title can be the same for all of the product ads and the sub categories can be a numerical sequence from 1 to 1,000. This can be performed directly with the database itself. If you do this then you will end up publishing 1,000 product Ad pages with each page containing a single product ad.

Sam Raheb
XLEcom Program Developer