Cahartes wrote this at CC series.
in your forecepools file for the BG you are interested in (or all), make sure you have 8 or more companies available--infantry in infantry BGS, Kompanies or Squadrons (company level echelon in unit structure) for armor BGs, etc.
About how fpools works, check the panthers in the fog workbook, it is similar or equal. In the fpools you can see the companies from each battlegroup and the percentages which they will give you the amount of them at each battlegroup. The UnitStructure is more complex,probably a complete mess because there are companies formed by other companies (the subteams) and companies formed by normal teams, you must recognize both.
Personally the unit structure file has a small problem, it looks as a complete mess for most of the people by the names of companies where you can recognize what is exactly each line and there are not differences in the names between one with subteams and one with teams. By this reason, I would rename it, at the end, the name showed in the game is not the name from the unitstructure (probably).
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