@Vance:
OK Viracoccha this sounds good, just let me picture it with an example because the possibilities are complicated. Suppose it is G1 with the alpha 3 setup with the addition of 1 commander in Southern Greater Germany. The German player decides to attack East Poland with all the land units from Poland, Hungary and Romania, and the 2 Sgr tanks plus their commander. After crushing the 2 Soviet infantry with 5 tanks and 7 infantry, the infantry stay put in E Poland. My question is can the German commander pull all 5 tanks back to Hungary, or the just the 2 that started out with him in Sgr, or just the 3 that came from Pol/Hun/Rom, or none of them?
I know this question was addressed to Viracoccha and his hybrid rule, and you can read his answer below your post.
In case you would ask me that same question, but to the clean rule, I would say:
A Leader will make a Task Force of all units in his own space, and them only. When Rommel was in Libya, he did not commandeer tanks in Russia, because they had another Leader. It would ruin the game playability if 4 different Leaders was commandeering each of their unit type from a bunker in Berlin, with a range of 8 spaces for their influence, and at the same time the 3 different Leaders in Moscow was denying the German Leaders their abilities. Also I think YOU act as the Supreme Field Commander when you move units around on the map, and you dont need a specific plastic unit to represent yourself. The Leader unit must be a skilled general commandeering a limited Battle Group, not the whole theater.
So to your specific question, the Leader in Southern Greater Germany could only commandeer the 6 inf, 2 art and 2 tanks in Southern Greater Germany. He could attack Yugoslavia and later retreat with his Tanks (they got 2 movement points) or continue into Romania with his tanks only. If he would join the attack on Eastern Poland with his 2 tanks, they could not retreat nor continue attacking since now their 2 movement points would be used.