Wix POS Register: Editing Orders
You can make changes to an existing order after checkout, including updating items and prices. Orders can be updated if they haven't yet been fulfilled or refunded.
Tip:
You can make changes to both online orders and point of sale orders.
To make changes to orders:
Open the POS tablet.
Tap Sales History from the bottom bar.
Tap the relevant sale.
Tap Actions.
Select Edit Sale.
Make any of the following changes:
Add a product or service: Tap the Plus icon

or Add Product to scan or select a new product.
Add a custom charge: Tap Add Custom Charge to enter an amount.
Adjust the item quantity: Tap plus or minus in the quantity selector to adjust the amount.
Edit the price of an item: Tap the Edit icon

next to the item price and enter a new price.
Remove an item: Tap the Delete icon

next to the item you want to remove.
Add or Remove a discount: Tap Add Discount or the Delete icon

to add or remove a discount.
Add or Remove a fee: Tap Add Fee or the Delete icon

to add or remove a fee.