I am looking to apply the discount to only one item in the cart. For example, I have 5 SKU's that receive 25% off when they use a discount code. I have it set up where if they add 2 of Product A to the cart, the discount only applies to 1 of them. However, if they add Product B as well (another SKU that is part of the discount code) to their cart, it now is applying the discount to both products. How do I work around this? I want the 25% to work on only ONE product in the cart.