Categories will need to be created and then products can be mapped to those categories.
Once a product is attached to a category that enables to the product to push to your webstore.
After your store is properly configured you can move into Categories and Products. Click Here for more information.
In order to allow PSS to monitor/maintain your cart and products, PSS recommends that you do not add any products external the PSS catalog while the installation is still new. Ideally you should have a cart installation that only carries the PSS catalog. After you have 100,000 PSS products up on your site fully functional for a period of 90 days PSS would then authorize you to add products external PSS.