We want to MAP specific Inventory locations between source and destination stores, so one inventory location can MAP to another in a different store, for example we may have 7 inventory locations in the Source store, A,B,C,D,E,F,G but we only want to offer inventory from specific inventory locations within the Source store to specific inventory locations in destination store(s) - currently we can select 1 location or all, we need to refine down at both ends - but we need to be able to expand this infinitely between source and destination stores, as some stores will only be able to access some inventory