You can categorize products in two ways: Yahoo! can automatically categorize your products free of charge or you can assign your products to existing Yahoo! Shopping categories when you set up your listings. For the quickest results, let us do the work for you!
If you decide to categorize products yourself, it may take a little longer for your listings to appear, since all non-automated product mapping needs to be reviewed by Yahoo!. You'll find more information about categories on the My Account page after you sign up for Product Submit.