Trigger and Variable help: how to assign the unit to the Variable?

[N00b-Morti]

I'm trying to learn things messing around with the Main Campaign but I already faced a problem. I'm scratching my head around since an hour.
For context it's Mission 01 of Human Campaign.
I'd like to change the bandits units that ambush you. I found units they are just hidden between the trees so they are already present in the map. But the editor doesn't order to the sepcific unit to attack: it has a variable. "Abusher01", "Ambusher02" and so on...

So I went to look what it consisted of and I found out this that to my noobie mind means nothing.

The game just knows this name is a Unit, but how does he know it's the Bandit? And how can i change it?

Please don't tell me a shortcut to do it: I know i could just put dryades between the tree and select them as units to make the ambush... but i want to understand how the variables work.

This is something happeing in all the campaign. So my question actually is: HOW do i assign a specifi unit to the variable, and how can i understand who it is on the map once is done?

Thank you very much to whoever will take some min for me.

 

[DaneTheBeast]

If you open up the Object Manager (F11) and go to "Variables" you can see all the places it is referenced, what's probably happening is that at map init it saves the unit (bandit) to that variable.

 

[N00b-Morti]

Thank you very much. You made my day <3