Hello I want to make a new animation for a sitting furniture without replacig existing ones .. is that possible and if so how?

possible?

Not unless you use new/edited behavior files. Apparently, someone has found out how to make new animations, but I'm not sure if 100% done. Link http://skyrim.nexusmods.com/downloads/file.php?id=15906.

I checked but I didn't understood what it does ... any tutorial out there?