How to Apply Cart Promotion After Catalog Promotion Discount?

Hello CS-Cart Community,

I have set up two promotions in my CS-Cart store:

  1. Catalog Promotion: This applies a fixed discount of $100 to individual products in specific categories.
  2. Cart Promotion: This applies a 3% discount to individual products in the same categories.

Currently, CS-Cart calculates both promotions using the base price of the products. However, I would like the Cart Promotion to apply the 3% discount after the Catalog Promotion discount has already been applied, not on the base price.

How can I configure this in CS-Cart? Is there a way to set the Cart Promotion to use the discounted price (after the Catalog Promotion) rather than the base price?

Thank you for your help!