You could change the quantity of each order.
Click on the quantity count and enter the quantity if you have a large amount of order.
Discounts can be given by percentage or by price.
To apply a discount that has been set up under Discount, click on the "info" button.
Price can be overwritten. However, the price cannot be overwritten at the value of 0.
For the order that has not been sent to the kitchen, you could still modify the modifier for this item.
For order that is sold by weight, edit the weight and the price will be recalculated based on the new weight.
Remarks will be printed to the kitchen.
If configured, remarks can be printed under the customer receipt and order list as well.