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After selecting the type of discount they would like to add, the user will see a dialog specific to the discount they chose. Please see How to Add Different Discount Types for more information.
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When a discount has been added to the sale, the user will be able to see the amount removed from each sale item, and they will be able to see the discount listed as a separate sale item. The amount removed by discounts is shown in the totals at the bottom of the cart as well.
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