After an item is added to the order, you can edit the item quantity or variation (if applicable):
  1. Under Order, tap the required item to open the item detail screen.
    • User-added image
  2. To change item quantity, tap + or , or tap the number to manually enter the required quantity. 
    • Note: For an item with no variations, tapping the item on the sales screen also increases the quantity by one per tap.
  3. To change the item variation (if applicable), tap the required variation.
  4. Tap Update.