To add additional cess on products,
Step 1: Go to “Products” section.
Step 2: Search/Select the product.
Step 3: Click on “Edit” to make the changes in product.
Step 4: Click on Optional fields and Click on Cess on Quantity( in Rs.).
Step 5: Enter the Cess value in rupees per quantity.
You can also select “Cess on Quantity comes under Rate(in Rs.)”.
Step 6: Click on Save Products details to update the additional cess on products.