@Sylver64

Sonos in general is a multiroom system. That means you can group each of your systems rooms to one or more of the others as you like. In your case the two Era300 can be configured as a stereo pair (one room) or each as a single speaker to have two rooms. The Move2 as a single speaker will be another room. 
So you can group or ungroup the two (or three) rooms to play synced together or each on its own.

That’s kind of the point of Sonos: a whole home audio system.

Yes, here’s a Sonos support link that explains how to group/ungroup your products to play music audio in perfect sync…

https://support.sonos.com/en-us/article/group-and-ungroup-rooms

Thanks to all !

Multi room broke with the new POS app update.  I can no longer get units to play in a group.

… also with the new crap app, I can no longer have something playing in one room and a completely separate music service playing in another.  If anyone knows of a way to get the former S2 app for IOS installed that would be great.