Miysis

Hello, me and a friend liked to play coop sniper missions and now we wanna try to make our own mission. But the first question from us... can we work on the same mission at the same time? I would like something like the 3D Editor where we both can join to work together... maybe one is build a enemy camp and the other makes some minefield or another enemy camp. I think you guess what I mean. So is this possible? Greetings Miysis