There are seven steps.
1. Create tall objects. I suggest iron pillars putting one ontop of the other..
2.use a jetpack to get to the top
3. Add player with parachute as default weapon
4.crete objects at different heights and checkpoint coronas at those heights.
5. Add a target landing spot checkpoint
6. Add one or more enemy actors and objective actors.
7.thats it.you have a parachute mission which can be incorporated into another mission.