I wouldn't call myself an expert by any stretch, so take this for what its worth.
First - note that I think it takes a turn for a reassign to become effective. Its no longer with the original unit, but its starred with its new unit which means that it can't be moved again, and I suspect isn't available yet.
Second - the most efficient method is to directly assign from one unit to another, but isn't always practical. Make sure you LOCK your HQs before you end the turn (can be done en masse from the Commander's Report). The next most efficient is to send it to OKH, and then rail the OKH around and assign directly to where you need it (if you are assigning FROM the OKH to other units - as in you are in the OKH list and clicking on a specific SU and then from there selecting a specific HQ to send it to - it doesn't cost any APs, where as any other method costs 1 AP per move).
Third - OKH can have an almost unlimited number of SUs, Army Group HQs a lot, same with army HQs. Corps HQs are limited to 8 (or so... depending upon how they get there). A German division is limited to only 3, which is more than you'll need most of the time.
A Brigade/ Regiment or short division is limited to 1... maybe. I find that directly assigning to Regiments is rarely possible, and many Minor Axis units can't seem to take direct assignment even if a full division.
I try to make sure that as many corps as possible have three Artillery battalions, a mixture of 105s, 150s, and 210s in most corps. There aren't quite enough units to go around, but you should get the vast majority with three battalions, and a small number with only two. Most of the artillery (by a small margin) is 150s, which is all right. The really heavy guns (240s, and 350s) I try to concentrate where they are needed, usually replacing one of the other battalions.
The Nebelwerfer rockets aren't very numerous. I generally assign the heavy Nebelwerfers in single SUs to supplement the artillery of some corps that I think need some heavy punch. The regular sized Nebelwerfers I assigned in twos or threes to either bolster some artillery for a heavier punch, or where the unit is short on regular artillery and need some more.
There is also enough AA units to go around so that every front line corps has one (the mixed battalions with the 88s are the best for corps because there is a chance the 88s will be assigned to a combat, which is awesome as they were fantastic AT guns all through the war). Army HQs I usually give the battalions without the 88s as they should only be occasionally needing to do AA duty. The truly behind the lines units (security HQs, Army Groups, and OKH) I don't bother giving AA defence.
Panzer and motorized units I assign the SP flak companies (most AA cannot be assigned at the division level, there are barely enough units that can be assigned at that level to go with the mobile forces). The mobile units have some intrinsic AA, but I feel a little more is a good idea. You can even assign a few motorized AA battalions at that level which will have 88s, which is totally awesome!
There are enough pioneers to assign one to every corps, with a few spares to assign where necessary. As stated previously, I assign each panzer division a pioneer group so they always have them available when attacking fortified positions or across rivers.
You don't have a lot of StuGs (assault guns), panzerjagers (towed AT guns, often the less than thrilling 3.7 cm PaK 36, AKA Heeresanklopfgerät), and a very small number of jagdpanzers (SP tank destroyers). I spread the StuGs out as much as possible with a few specifically assigned when attacking fortified positions. Panzerjagers I also spread around, although if expecting a lot of armour it could be of benefit to assign some to those corps. Finally the Jagdpanzers I assign directly to motorized units for a bit more heavy punch.
The rest - bicycle recon, MG units, etc. - I spread around, or leave where they start. There are some SP Infantry Guns that start with panzer divisions, I typically leave them in place.
The Rumanians start with a lot of MG SUs so you may as well make sure they are spread out, should also make sure their AA and AT guns are spread out a little as well (they have far less of these SUs, but the Rumanian units need all the help they can get, so give them help where you can).
Mostly with the regular infantry I leave any StuGs, pioneers, panzerjagers, et al. at the corps so they can be assigned to any division as needed. Its not guaranteed, but seems to work pretty well. But when I'm in a siege (like Leningrad or Sevastopol) or have run into a particularly stubborn fortified line, I will assign StuGs and pioneers directly to the infantry I am going to use to assault the line - usually on the turn before they are to begin the assault.
< Message edited by neuromancer -- 5/28/2011 12:02:36 AM >