Best answer by Contemplative
I've read a number of posts where people get hung up on this very situation, so let me try and provide some points which I hope helps
1, Room/speaker names are just labels and has nothing to do with anything other then providing you a way of identifying the speakers. you can call it anything you want, Jack, Jill... I have a speaker called bedroom in the kitchen, why? well because, though intended for the bedroom. I sometimes move it between the bedroom and kitchen and lately has found a semi permanent home in the kitchen.
The key point is you know what your speakers are called and you know where each one is placed
2, The only way to truly combine speakers as a single room is either by bonding or pairing. Pairing is when you add 2 identical speakers (Plays 1, 3 and 5) and create a stereo pair, while bonding is when you add a Sub to and speaker or paired speaker or when you bond a Play bar with a sub and/or paired speaker set, creating a 5.0 or 5.1 surround. Paired or bonded speakers loose their individual identifies and is a semi permanent and the individual speakers in pair on bond looses their individual identity
3, Grouping is when you combine any speaker or paired or bonded group of speaks to play in sync and its a temporary group. The speakers in a group can be in the same room or in multiple rooms but they retain their separate identities
4, I don't believe you can true play grouped speakers (someone else should be able to confirm) only individual, paired or bonded speakers can be true played as they act as a single entity.
So to answer your original question, to move speakers between rooms you can either simply change the speaker name to reflect its new location, or as I have, leave the name as it because I know the name of the speaker and I know where it's placed. So when I am listening to music in the living room and I need to get dinner going, I simply group the speaker called "bedroom" (Play1) to another called "living room" (Play 5), by the way I also have a play bar in the living room called "Living room 2"
if you want all the speakers in a single room to act as a single entity, which you can then true play, you will need to either pair or bond them, but to do that you will need a specific combination of speakers.
2 x either of Play 1, 3, or 5, with or without a single sub (stereo pair with or without sub)
Play bar and a sub (3.1 surround)
Play bar with 2 x either of Play 1, 3, or 5 (5.0 surround)
Play bar + sub and 2 x either of Play 1, 3, or 5 (5.1 surround)
(I wont even bother going into the combinations possible when a Connect or Connect Amp is thrown into the mix)
I hope that makes things clearer