Let`s say, the KOT has been generated for an order (to know how to generate a KOT click on How to make a new sale in Dine-In mode?). But you want to cancel an item(s) either because the customer cancels the order or the item is out of stock.

1. Click on orders to view open orders and click Resume to open the particular order.

2. Click on delete button, mention the reason for deleting the item and click on delete (Note: Item(s) can be deleted only before printing the bill) 

3.  To view all the voided KOTs please refer the article How to view KOT Void History?