Ok, I think this will be easier that it seems. Essentially you can just create a new page from the template and on this new page add in a recordset. In the recordset interface you will need to go to the advanced view and enter a query like this:
SELECT * FROM products
WHERE ProductCategoryID = 1 OR ProductCategoryID = 2
This one would give you categories 1 and 2 items. If you want to include more you can just add to this with another 'OR ProductCategoryID = #'
If you take a look at your products table in your db you should be able to see this column and the values associated with it.
After you add the recordset you just go to the bindings tab to add the info to the page, then you highlight the bindings and go to Server Behaviors > Repeat Region. This will let you display all of the records from your new rs.