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For multiple plans  to  (numbers can be skipped), file naming you add " ^[nn] " to the file name.So basically you save a plan and add "^xx" to the file name, where xx is the plan number (see screenshot below).
If "default" ( no plan number ) file is found, it is ignored if numbered plan is found. Otherwise, default file is used.
Each plan can have unique groups, group names, and scripting orders...
It is a combined human general, randomness of plan, and AI (as soldier only after general is done!).
This is same and can be used for Non-AI scenario groups.
To make the plans, save a group/scripting in regular scenario, then rename and add plan number to filename. Later save more
plans and give them numbers. Later you can copy them to AI folder.