Create Button to "Link" Lights

Yes, most things are if you are keen enough…

Groups would be the fastest to setup and means you create another set of controls for a MASTER which @rossko57 possibly gave a link for.

You could use a virtual switch that enabled a rule to copy and send the controls to the others to get what you want but the rule may get complex…

Or another way is to use scenes which is the way I prefer to set the ‘look’ of a room and it is how professional lighting rigs are run. See this thread for ideas which it can be triggered from switch and not just from a google home…