Apparently that option was accidentaly removed, so should be back. Until then here is the text from a .mis file that shows where to make it a scripted spawn group manually.
Code:
[BoB_RAF_F_32Sqn_Late.01]
Flight0 1 2 3 4
Class Aircraft.HurricaneMkI_100oct
Formation VIC
CallSign 23
Fuel 100
Weapons 1
Scramble 1
SpawnFromScript 1
Skill 0.84 0.84 0.53 0.53 0.53 0.84 0.53 0.53
Aging 0
Add in that line three up from the bottom.
I believe you can still add triggers and the actions from the mission editor, but you can see them at the end of .mis file like this:
Code:
[Trigger]
trigger32 TTime 720
[Action]
trigger32 ASpawnGroup 1 BoB_RAF_F_32Sqn_Late.01
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