Entire Sale Discount or Credit:
There are 3 different Discounts/Credits that apply to the entire sale in the Arrange Functions Buttons window.
Sale Discount: will prompt the cashier to enter the percentage Discount or Charge.
Discount 1 and Discount 2 which you predefine. Enter a 2.00 for a 2% discount. Or, enter -2.00 for a 2% credit. In the sales window the description of Discount or Credit will indicate which will be applied.
For a 100% Free Discount use the Free button. To exempt taxes use the Option button to select which taxes to exempt. Or, add the the Tax-exempt button to the sales screen.