AS of right now, the only way to accomplish this is to use the Z-Wave tweaker tool from the SmartThings community. You have to set multi-channel associations from one lzw36 to another. Here is an example of the association setup as viewed through PC Controller:
I’ve setup group 2 & 4 to point at node 201.1 (endpoint 1 = light) and group 5 & 7 to point at node 201.2 (endpoint 2 = fan).
Now, in the tweaker tool it looks like you submit the associations as below:
The node ID needs to be in hexadecimal so my node of 201 is converted to C9. The node IDs can be found in the IDE as the Network ID.
So in my example I would submit the association for:
Group 2
C9:1
Group 4
C9:1
Group 5
C9:2
Group 7
C9:2