Refinement of product revaluation

There is a need to make a margin rule not only for the brand, but also individually for the product. I would like to see this as an add-on block. fields in the product card. (only for admin. access rights), be able to choose a priority, for example, by default, the general markup rule for the brand, and in case of activation of the additional. block, it must have priority. The markup rule should not be as extended as it is now for the brand, it will be enough columns with existing prices and next to the column where the % markup will be entered. Calculate, please, how much the revision will cost.