Invoice and Estimate A4 template Edition

Merchant has request to have the discount column, which is an empty column that only displays zero from the template for the A4 invoice and for the A4 Estimate template as well. They have removed the discount tags but the columns still show zero digit in the section. Merchant wants that discount column and row on top of the discount column to be disappeared. While printing an invoice he wants to make sure there is no Discount column appears.