For there MH-60s the code is:
CHOPPER exec "\BAS_mah60\FX\BAS_AIRope.sqs"
For the MH-47s the code is:
[choppername] exec "basrappel2.sqs"
You can find basrappel2.sqs at [url removed]BASrappel2.sqs]http://www.ofpec.com/yabbse/attachments/BASrappel2.sqs[/url].
Put this in the "On Activation" field of a waypoint. Happy roping ;D!
P.S: This has been asked many times before. A quick search would've gotten you the answer