I have HomeSeer WD200+ Z-Wave switches I need to link together (via association group #1). The link allows the switches to work together (one switch directly controlling the other).
"ASSOCIATION - This product supports association group #1 for lifeline communication. Refer to your controller manual for instructions on setting the lifeline association."
Group 1 is for lifeline communication with your ZWave hub / controller. Use group 2 if yours trying to use direct association to allow one switch to control another.
The ‘how’ is dependent on your ZWave implementation. Are you using ZWave JS, Zwavejs2mqtt, or?