Use multiple product-level codes or one code per uniform-rate product group

Create one Advanced Discount Code campaign per distinct percentage group. For example, make separate Product Discount campaigns (each with its own discount code) targeting the products that should share the same percentage — e.g. New25-GroupA (25% on products A/B), New15-GroupB (15% on products C/D). Alternatively, if you want one code, use a single Product Discount module that applies the same percentage to a selected set of products (but all selected products must share the same rate). If you’d like, provide the product lists and desired percentages and we can outline the exact campaigns to create.