How to spawn a random no of units

[Mangrove Jack]

I have managed to do a random spawn of 1 of 4 jtac's and spawn ground AI vehicle group (armour) and AI Helicopter Group based on jtac spawn. However I would like to do a random spawn of the number of units in the vehicle group and chopper group (also maybe types of units if possible?) but cannot find references at this point that helps me.

 

Anyone able to say how or point me in direction of information?

Edited December 22, 2019 by Mangrove Jack