Thing is, on the 635 group, I want everything with the ProductCategory 635 to have the metal option. I have hundreds of products with that product category and don't want to enter them all again separately in a second table. With sizes, because every item isn't available in every size, I understand that I will have to do them individually. The reason I created the ProductCategory column was so I could apply the metal option to an entire grouping of products at once.
edit: Note that the 635 ProductCategory doesn't have a number in the ProductID column (first post).