2.6 How to Enable Line Level or item-wise Discount in QuickBooks?.2.5 What to do if the Discount Column is not Visible in the Printed Sales, Invoice, Receipt, Estimate, or Credit Note in QuickBooks?.2.4 How to Create a Subtotal Item to Apply a Discount to all items in an Invoice?.2.3 What are the Ways to Add Discounts to Items and Invoices in QuickBooks?.2.2 Step 2: Add the Discount to an Invoice or Sales Receipt.2 Steps to Add a Discount Item with a Fixed Price.1.1 Step 1: Turn on the Discount Feature.1 Instruction Steps to Add Discount to Invoice or Sales Receipt in QuickBooks Online.