Connecting two subsets in formulas

[AnaplanIdeas]

Description:

I want to save server space and put all promo packs to a subset, but I have two types of promo packs, which have different calculations. Eventually I am obliged to sum them up without use of subset, which occupies a lot of excessive space.

Example of enhancement:

Create total promo packs subsets out of two subsets - "Gift packs" and "Banded packs" - that are planned separately.