How to resupply

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I think the units cannot take any action. No shooting or loading either.
Working from my creaky old memory, everything works down the list.
A0 reloads before B0, which reloads before B1, C0, D3, etc. HE loads first. So if you are reloading a tank, the HE will load until full, then the AP until full, then the 'Special" ammo. HEAT, APFSDS, etc.
Reloads are by slot also. Slot 1 before slot 2 and so on.
Example; You have a British Grant that has shot it's magazines dry. The slot 1 weapon is a 37mm in the turret. It will fill up the 37 HE, then the 37 AP Then it will do the slot two, which is the MG, IIRC. Then it goes to slot 3, which is the 75mm.
I'm not sure how the 'load points' are allocated anymore. Originally, All points went to the first unit on the list but I seem to remember a heated debate about that along about version 3.5 I think that the change was to up the load points and then divide them among the adjacent vehicles. So if there are 4 units around the ammo dump, the load points are divided by 4.
Not real sure about that. Been many changes. It was around that time that I stopped playing with ordinance units. Logistics is an operational and strategic concern. Tactical units get supplied between battles. SP is a tactical game.