Follow this Video Tutorial:
https://www.designbyday.co.uk/dbdtv-tutorial-how-to-add-a-discount-code-to-an-individual-product-in-magento-ecommerce/
Instead of using SKU as the rule, use the Product Category so the discount will only be applied to products in this category without effecting other products in the cart.
Magento: How to Add a Discount Code to a Specific Category in Magento Print
Modified on: Mon, 9 Apr, 2018 at 10:55 PM
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