I actually just pulled the images from a previous post of mine. It should all be spelled out in these posts, but let me know if you need additional clarification.
Association group 1 (Lifeline): This is the device your switch communicates status updates to. It is set automatically when you include the dimmer, and should almost always point to your hub.
Association group 2 (Basic Command Class): This is used to send basic on/off/dim commands to another device. Almost all devices support this type of command. It can be used to send on, off, or a dim level, but does not support dimming duration, and does not allow you to hold the button down to graduall…
There are a couple different ways you could set things up. Basically, pick one switch to be the “parent” switch, and all other switches will be considered “child” switches. The parent switch needs the parameter set to 15, and all children need the parameter set to 11. This setup supports up to 6 devices (1 parent and up to 5 children).
The parent switch associates with all children on groups 3 and 4, and has parameter 12 set to 15.
The children switches only need to associate to the parent …