There are two lift scripts r3f and btc, the btc one you need to modify the hud.hpp file so that there are no conflicts with rsctitles.
to get the lifting to work you need to add the heli classes from dayz if your talking about btc, for r3f there is a big file where you put the class list of what you can lift and transport.
the btc one has a demo to go into the desert and examine how it works, there is a bug i think in it were it doesn't deploy the chute right.