Please note that adding additional cess in rupees is only available in our rise/e-invoicing plan.
To apply the additional cess on the products while creating the invoice you have to add the additional cess in rupees in the product details first.
To add the cess in rupees Please go to Products > Add/Edit > More Details > Cess on Quantity > Enter amount > Select the applicable section > Update Item.
Please note that if you have added the cess rate in INR, please click on the additional cess option beside the product totals while creating the invoice.
Now confirm the charges to show in the invoice.