How do I edit individual leds on a light bar.

Hey everyone,
So I know this is possible as I’ve seen people do it before in onyx, but how would I edit individual LEDs on an bar such as this one ->

you would need to put it in the correct mode
in this case it would be a 80 channel mode then it would have 12 parts to the fixture
so lets say it is fixture 1 you then would have 1.1, 1.2, 1.3, 1.4 and so on till 1.12 and each point would be the individual