Hey,
You can use this script I made.
Edit: When you said that you want them automatically deployed, do you mean that they are already open? If so, I think that that is impossible.
The example mission is included.
To activate the script
put this in one of the members of the group:
[units group this, 200] exec "intopara.sqs"
200 stands for the height at which the parachutes will start at. You can change this to any height that you like.
Thanks,
Bluelikeu