I think I understand you in a subconsious way but this reminds me of school when the teacher says " If a train is heading west at 80 mph and a bus is heading northwest into Boston at 43 mph, how much would the boatfare be going southeast to Bermuda?"
Probably the easiest (and best) way to look at this is notice the movement type indicate just to the right of the unit name. One of your subformations gives the unit that movement type. If you click on that subformation in the right pane that lists subformations, you'll bring up the subformation detail screen. the pane in the middle, has three table, the first two are vs Sftypes, and vs classes, the third tab will list the movement type for that subformation, and gives Action Point cost for all terrain, as well as entrenchment details and other good stuff.
This panel reflects the costs for the specific subformation, in this specific scenario, so that if someone has modded the subformation it will be reflected here. (for example, given airplanes greater range).
Hope that helps.