Fixture Group Changes carry into Scenes??

Ok, I have created Groups of fixtures. I may need to move Fxt1 from Grp1 to Grp 2 at a later date. I have created scenes via calling groups. My question is: how do I set myself up so that when I do move a fixture to a differ group that change will follow through all scenes as well.

As of now when I move or delete a fixture from a group it is still present in all the scenes that are associated with that group.