I wish I understood how reinforcements went
I don't understand this question.
Unless your talking about units in the reserve area of the map.
These you will have to wait to move on the turn they become available.
run your mouse cursor over them to see when or you can wait till they light up on the turn they are available.
and how to fill up the ranks of depleted units.
At the beginning of each turn is the Op Phase.
Click on your units in your platoons(Then LMB or RMB can't remember which and some options will show on how to do some things) you can disband squads and any left over troops in the squad will go to other units in the platoon and open a slot to draw new units from the reserves or if you have conscript squads in the next 1x1 grid near a unit they will start filling the ranks of depleted infantry squads by AI choice.
You can also reinforce depleted squads from other squads in the platoon.
You have to play around a bit with the units to move people where you want them and it's still less than the type of control I would like as far as putting everybody exactly where I want them but you do have a little control as to who goes where.
There are some other things you can do also but I really don't play the campaigns enough to explain this with any type of authority or even clarity for people unfamiliar with this aspect of the game.
All I can say is trial and error eventually will be your best way to learn this part of the game.
Unfortunately,I'm still in that stage concerning the campaigns for this game.
