I don’t understand “on site” … could just guess: Maybe you mean an animation montage? Like to override some ongoing animation with something that happens dynamic? Like some “he fired NOW and should do some throw back its upper body a bit anim”? In that case just follow the https://www.youtube.com/watch?v=deHTxvogJNI tutorial until you reach the “fit and unfit” part. To be honest I owe this guy at least beer …or probably a few more (seriously). 
- His tutorial is perfect until you get to something like “multiplayer replication”. But even this could be done. I love this engine 