Discount Chooser simplifies the process of creating discounts based on items in the cart. You can create buy one, get one at a discount, buy two get one at a discount, or buy <some number> get a choice of <some number of other items> at a discount. Item specification may be done by category or by product.
Here's a video that shows you have to create a Discount Chooser discount, and how it appears in the cart for your customers.
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