OpenBuilding Designer - Why Item Sets removed from AECOSim?

Item Sets in AECOSim were highly useful in creating sets of elements and being able to make the rest of the items in 3D views to be transparent, or isolate the item set, or show different Item Sets as different colors for showing 3D graphical representation of changes.

Item Sets were removed in OpenBuilding Designer....closest i can see that USED to be Item Sets are now Named Groups but with limited functionality. Displayset is just a way to isolate.

Did "Item Sets" get moved/renamed somehwere that I just can't find it?