You don't always need to ask to learn, you often just need to read (and practice) to learn.
Especially when what you ask can be done without writing a single line of code : your helicopter has to be the leader, and each member of the group has to be set as "In cargo".
Now if you want to be the leader while sitting in the back, you'll need a few scripting skills :
this moveInCargo Chopper
this moveInDriver Chopper
this moveInGunner Chopper
...where Chopper is the name you gave to the chopper (I suggest you use an empty chopper). Then, you can put any soldier in the editor, and enter one of those three lines in the "Init" field of the soldier, to put it either as driver, gunner, or in cargo. This way you can have east units flying west choppers...
Next time you want to know something, try
http://www.ofpec.com, they've got plenty of tutorials in there.