Yup; use the “Group” feature. I think it has to be on the wifi network with the other speakers. 

Thanks for the reply but that doesn't work, (greyed out) says you need 3 rooms with sonos in, I only have 2

That’s to use the “Group Everywhere”; if you only have two rooms you just group the two of them. Just select the “circle” beside the second room. 

Yeah tried that but it's greyed out and says 

No circle beside room, only group option down bottom but can't select 

You have a speaker in your Kitchen room that is not connected, that it preventing any grouping

You only have two rooms: bedroom and kitchen. Kitchen is a stereo-pair but still only one room with two speakers associated with it. The “?” In “L+?” means the app has lost connection with the right-hand speaker of the pair. 

The Groups feature you’ve shown, greyed out, is for setting any semi-permanent groups. The other option is when you have a room selected in the controller app. Touch the symbol to the right of the volume slider and your rooms will appear, with the selection circles I mentioned in an earlier post. You’ll also have access to independent volume controls for your rooms. 

More about grouping can be found here: https://support.sonos.com/en-us/article/group-and-ungroup-rooms

Grouping rooms and saving a group are two different things. You need to group the two rooms, not save a group. Follow the instructions in this article under “Group rooms”:

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

Thanks fellas, when I turn up the Volume that's when I see the option to link. All good