I think what you are referring to would be something that happens in the Harmony.

You have to edit the activity and add and additional command to the start up shut down sequence. Traditionally it will only turn each device in an activity on. But you can add additional button presses on any of the devices, you can also add timed pauses to help space out the commands.

You can also create a custom sequence as a button, for example I have a "TV to Projector" sequence. It presses the projector on button, waits for a few seconds (because it takes a while to kick in) then turns the TV off.

This save me having to remap all the buttons for my "mac mini" activity, for both the TV and Projector.

I used to have it set up with "watch kodi tv" and "watch kodi projector"

but that was a nightmare making sure i kept each activity identical.