Since the room lighting app came out, I have moved a few of my groups over to room lighting. I am thinking of moving the rest. However, some questions come to mind. I have several groups within groups currently.
Example, due to the nature of some of the wiring, it was easier to use bulbs instead of switches that control my fixtures. Reason 1: No Neutral. Reason 2: I want to control lights that are on mixed circuits as whoever built the house and did the wiring did not group the lights in the same way I want to use them. One switch in the basement covers 4 fixtures. I only want to turn on 1 fixture at times, 3 in others (or a subset of the three), etc. For arguments sake, 1 fixture is a ceiling fan with three lights in the center of my den, the other three are individual fixtures with 2 bulbs each. One of those three is in a back room, the other two are behind my couch in the den.
So,in the old group system, I made a group for each fixture. I made another group for the three that are in the whole den, and I use 1 switch for the Main Den, and another for the Back Den. And lastly, I had a group for each floor that contained all the lights and switches for the floor (for ease of turning off the whole floor at one time)
With the old system, I put the individual bulbs into multiple groups as opposed to nesting a group to a higher level group. So, I would like wind up with the same functionality. But, I thought read that you cannot have two room lighting scenes "active" on the same bulbs at the same time. (Can't find it now, so maybe my recollection was wrong 
)
So, the question is whether it is possible to have a tiered nesting using Room Lighting. If so, would you just put the "activator" device as the member of the next higher level? Or, would it be the individual lights?
For reference, the layout is below
Layout
All of the colored lights are on one physical switch with no neutral.
The Red is the "Den Light"(Group)
The Green are the "Back Den Light" (Group)
The Yellow is the "Gym Light" (Group)
Not Highlighted is the "Music Room" (Group - only fixture on a separate switch - But, it is a three way with no neutral)
At the top level, I have a "Basement" group that includes ALL the lights. Currently, I have setup individual button controllers for each of the smaller groups and a long press of one of the button controllers turns off the "Basement" group.
I will also add that the fans do not have separate power at the wall. So, if I were to go with a switch, then I would have to rewire everything to keep power to the fans when the lights are off.... ALL of my ceiling fans are wired this way..... UGH.
