That’s too bad, I kinda hoped the system would be smart enough to do that for me.
If you choose to use voice control and use Amazon Alexa ‘enabled’ Groups’ you can actually make the Sonos ‘rooms’ group/ungroup automatically depending on the Alexa device you speak to and the instructions given… or you can use the features in the Sonos App to do those things. There’s a bit of a learning curve to begin with, as there is with any smart-home product, but Sonos with Alexa works very well I think.
There’s is also group volume control or individual room volume control using voice or the App.
However don’t mix up ‘grouping’ with the terms ‘pairing’ or ‘bonding’ as each of those are different things... you can stereo ‘pair’ speakers and ‘bond’ speakers together in a Home Theatre setup.
So you can ‘group’ standalone speakers, for example with products that have already been ‘paired’ or ‘bonded’ together… the ‘grouping’ is quite fluid, whereas the ‘pairing’ & ‘bonding’ is a bit more of a (semi)-permanent type of linking.
As an example, just to perhaps help explain, you could have a stereo pair of speakers in the Kitchen, a bonded HT setup in Lounge (Arc, sub and 2 surrounds) and two stand alone speakers in the Dining Room and simply say to Alexa “Play some music downstairs” and if the Alexa groups are setup correctly, every speaker mentioned (part if the downstairs group) can be made to auto-group and play the requested music.
You could the goto the Lounge ..and either using the TV remote or another Alexa voice instruction, switch on the TV and the TV will automatically break apart the earlier (downstairs) group and play to the connected Arc, sub and two surrounds only in that one room .. there are however other settings to make them not break out out of any previous group - so there are some customisation options to fit most users needs.
I hope that additional information helps.