Secret45, I am not really sure what you mean.
I am not an expert here but the way I try to make my own scenarios is just looking at the units info in the mission editor. I take my time scrooling to the formations and checking the units options at each one. I try to select forces by PF values and first year and last year availability for example...just to try to have an idea how to compose a balanced fight...(T-55/62 against Pattons/Centurions/Chieftains, T-72BM and T-80BV/U against Challengers, Abrams and so on)...at least in a very general way. The same for aircrafts and other units...I always try to include Tanks, Mechanized infantry, some AAA, Anti-tanks units, Helis, arty and aircraft support to have a nice and interesting mix of things....I do mostly small to medium size fights...
After some attempts, trials and errors, you start getting a pattern to create some nice engagements.
Probably not historical accurate, but I dont care, I look having a fun time from time to time to break the daily work a bit above all. I also tweak my databases to my liking...so...its the way I enjoy this beautiful war simulation. Its like a chess but with military units. :) Very fun.
Other members here will probably have more professional tips, of course.