Create or edit categories themselves from "Manage categories" above the product list.
When a product has variants, the register prompts for one before it can be added to an order — each variant is its own full price, not an add-on to the base price above.
Tick which modifier groups apply to this product. Create or edit the groups themselves from "Manage modifiers" above the product list.
Leave everything unticked to keep this item on the menu at every location. Tick specific ones to restrict it to just those.
Sold and priced as one item — stock isn't deducted from the individual dishes listed here.
Leave both blank to make this available all day. Used for things like a breakfast-only or late-night menu.