When in the Shopping Cart and selecting certain items for a customer's order, you can navigate through these items in the product catalog. The items in the catalog are grouped by categories. When there are a lot of categories in the catalog, not all of them may appear on the screen at once. In this case, you would click on the arrows below the categories to navigate through all of them.
To view products from a particular category, tap on the category name
When there are a lot of products in a category, not all of them may appear on the screen at once. If this is the case, you would click on the arrows below the products to navigate through all of them.
To add a product to the cart, tap on the product in the catalog.
If the product has modifiers (set up in Back Office), the modifiers will come up after you click on the product for the option of selecting.
Another way you can add a product to the cart is by scanning the product's bar code or entering the product's UPC in the ‘Search for item’ field, found above the product catalog.