You have to edit the individual entities, not the squad. So you want the ebps category. Then, it looks like population_ext is the one for population. I'm not 100% certain but I think other resource costs are under cost_ext > time_cost (I don't know what the time part of it means, but these seem to list the amounts matching those in the game). Remember that for infantry squads you need to divide the in-game costs by the number of squad members.
Edit: And reinforcement cost will be half of that.
Edit2: VVVVVVVV That's what Windows Calculator is for