How Do I Link/Mirror/Group Devices for Group Control?

Configuration
1

I am still new to Home Assistant, so forgive my ignorance and not knowing correct terminology. I would like to “link” or “group” several devices such that if I turn on (or off) Light1 from Integration A, then Light2 from integration B will turn on (or off).
If I wanted to “link/group” one single pair of devices, I suppose I could create 4 automations:
if Light1 goes on, then Light 2 on
if Light1 goes off, then Light2 off
if Light 2 goes on, then Light1 on
if Light 2 goes off, then Light 1 off

If I want to create a half dozen different groups with 2-6 devices each, doing that simple automation scheme would get bulky. But I’m guessing there must be a better way. Please advise on how I can do this efficiently. Thanks.

2

Just create groups for each of the sets of lights, then use those groups to control the lights.

3

Hello ZombieSlug,

4

Thanks for the assist. Not sure how I missed Groups.

I set up my first Group in a few minutes, but not sure it is doing what I want. Of course I can turn the group on or off together via Home Assistant. But what I want to achieve is if one member of the Group is turned on/off, for example via an outside control, then all lights in that group would turn on/off. I am not seeing it do that. Am I missing something? I don’t see the Group Options…All Entities check box as shown in the documentation, if that is what I’m missing.