Upsale refers to products and discounts you offer customers during the checkout process. Customers can add the offered product(s) to their order, or decline and continue with their order as is.
The basic process of upselling is:
1. You add an upsale product. This can be misleading, because you are not creating a product, but instead you’re taking an existing product and creating an entry that prompts the system to offer the product to customers during checkout. Creating this kind of entry does not alter the product in any way. You can also control when customers are offered an item during checkout by selecting Display and Upsale Options.
2. You link the upsale product to one or more products in your store. For example, let’s say you have a shirt product. If a customer buys the shirt, during checkout you would like to offer them the order a matching hat. To accomplish this you would, create an upsale entry for the hat, and then lick the upsale entry to the shirt. That way, when a customer buys the shirt they are offered the hat during checkout.