When your at the New Sale Screen, Enter the Stock Number you are wanting to discount Click the item you are wanting to discount, so it highlights Red, Then Click

At the Home Screen you want to Select number Four, like the photo below, And Type in the stock number that you are wanting to change the price of and

Select Number 2, just under the Search Bar, and search for your sale number that you want to print off a tax invoice Click the sale you are wanting, so