Every product in your catalog must be assigned to at least one category. Before you can add products to your catalog, you must first establish its basic category structure. A product cannot be saved until after it has been assigned to at least one category.
To set up the product categories:
1. In the Product Information panel on the left, select Categories.
2. In the category tree, select the checkbox of each category to which you want to associate the product. Click the plus [+] icon to show any available subcategories.
A single product can be assigned to more than one category.
3. When complete, click the Save button.