If you have an ‘active choice’, the choice is exclusive, so you can’t set ‘some of A’ and ‘some of B’, you probably need to restructure your options if you want all the (1,2,3,4,5,6) options to be a separate selection from the initial choice (A or B)

As for storing the values, you can do that in several different ways, either putting the values in a build wide variable after the start, or saving a build artifact by writing the choice results out to json or yaml files, and tagging them as a build artifact so you can access them later.