How to Build an Order Form With Line Items

Orders rarely contain one product. Line Items let a single order hold many products with quantities, without a hidden helper table.

1. Create Customers, Products and Orders.
2. On Orders, add a Line Items property linked to Products, with a quantity.
3. Add a Rollup for the order total: "sum of price times quantity".
4. Share the order form with your cashiers so they can enter orders from their phones.