A: Complimentary refer to dish(es) given free of charge.
It can be selected for each item in the checkout page or billing page.
Example:
Select an item as a complementary for a guest
Select Complimentary
You can leave a note for the name of guest or reason of giving the item as complimentary.
Once tap "Ok" it will show on the item it is a complimentary and the price is 0.