If you want to set the CESS Option in Stock Item and Print CESS Info In GST Invoice then, Go to Sales -> Edit/Delete Stock Item -> Enter the Item ID or Name and select the Item -> Then Click Edit -> Again Click Edit -> Click on GST Adv Tax Settings -> Tick on the Include CESS box -> Enter the CESS percentage -> Tick on the box Calculate Cess Amount Based On GST Selling Price per Unit If that is applicable else don't select that -> Set -> Update