How can I make an AI country fully annex another different country?

[Whomidity 0]

I am working on a custom scenario w/ a civil war and I'm trying to use events to ensure that if one of the belligerents is fully occupied, it'll be annexed by the belligerent whos troops are in said country. Any help will be greatly appreciated, thank you!

[AlbertArmenia 61]

You can do it with events, when some parts(or all) of provinces are occupied, return all provinces to the one who is losing, and than give back control to the wining one.