1. Create two groups: Group 1 and Group 2
2. In group 1 are the devices of the group that we want to arm with the general arming. We have to enable the option 'Arm with general arming'
3. In group 2 are the rest of the devices (the ones we are going to arm with the Night Mode). In this case, we disable the option 'Arm with general arming'
4. One by one with the devices I want to arm with the Night Mode (the ones in group 2), I have to activate the 'Night Mode' option that we have in the configuration of each of the devices.
In summary: when the arming button is pressed, Group 1 will be armed and when the Night Mode button is pressed, the devices in Group 2 will be activated (but they are not armed by this group but by the Night Mode). We created Group 2 because to use the group mode we have to associate all the devices.