Take a look at the way the 40k Imperial Guard is set up. Specifically the Infantry Platoon.
It uses hidden options to add the command squad and minimum 2 regular squads. Then you can use the same options made visible to add more. And then you use exclusion groups to watch the min/max number of the options taken.
For a few things in those files, and in another game I'm working on, if there is a cost per model issue, I get the CPM close and then use an automatic hidden option to add/subtract the final points adjustment needed.
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