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Before you add products to your catalog, you need to establish the basic categoryA set of products that share particular characteristics or attributes. structure of your catalog. Every product must be assigned to at least one category. Categories are usually created in advance, before products are added to the catalog. However, you can also add categories “on the fly” while creating a product.
The category structure of your catalog is like an upside-down tree, with the root at the top. Each section of the tree can be expanded and collapsed. Any disabled or hidden categories are grayed out. The first level of categories below the root typically appear as options in the main menu. Below that, you can have as many additional subcategories as you need.