Verify that each product entry has information that places the product into the appropriate category and subcategory. You can confirm if there is the same product in the existing catalog by classifying the correct product category. See Match Your Products for more details of matching your product information.
When customers use Browse or Search, the resulting list of products is grouped into these categories and subcategories according to the Browse Tree Guide. For more information about using categories to leverage browse and search results, see Use Search & Browse. Your products must be classified under correct nodes to be found using Search & Browse. Click here to learn about browse node and refinement.