Put this in the init line of the group leader
"_x moveincargo Chinook1" forEach units group this
As for the jump, look in the Ed Depot, I think there are some parachuting scripts there. The secret is
loon1 action ["eject",Chinook1]
or something, syntax not guaranteed.
The Chinook does not have to bein the their squad, its better if it is not.
Search the FAQ and the forums too.