You need to do it through SCAR coding and pack it up with the map .sga.
I have been able to spawn units and play around with them, or do things like drop an offmap after a set time.
Here's where you need to go. RN.com has alot of tutorials.\
http://forums.relicnews.com/showthread.php?211948-How-To-Some-Basic-Scar-for-MappersHere is also a list of SCAR functions that you will need to learn to make them work.
http://www.europeinruins.com/ScarDoc/scar_doc.htmAside from that I dont think anyone here can help you (even me, it was so long ago, i couldnt tell you what to do)
Maybe your first step is to dismantle one of CoH's single player missions and see how they work.