Now that you have created your categories (CLICK HERE if you have not), follow the steps below to see how to add products to their respective categories. If you do not have any created product or service yet, CLICK HERE to see how to create one.
Step 1: Goto Administrative, Products and select Product List.
Step 2: from the product list, select the product you wish to move or you can select multiple products by holding down the Ctrl button on your keyboard while selecting the products.
Step 3: after selecting the product(s), right click on any of the highlighted product(s) and select Move to new Category, choose a category from the list and press Submit when done.