You need to perform the below steps to do an exchange on POS: 1. From the shopify POS app, you need to tap orders. 2. Now, click on order for which you want to create an exchange 3. Click on exchange 4. On the select items to run screen 5. Hit next 6. On the select new items screen, choose the new product from the products list to exchange the returned item for 7. After everything has been added, hit next