@ghr2:
if a transport starts the turn in a hostile seazone, then combat takes place in that seazone but the transport has not loaded or unloaded at all so its not assaulting anything, can it in non-com load a unit while in that seazone and move to another seazone to unload if you clear that seazone in combat?
No. Any ship in the seazone participates in combat - The transport is still a combatant but has no attack or defense.
You have basically two options:
A) Move the transport out of the seazone during the combat move. It can load in another seazone, but only if the units are used for an amphibious assault THAT turn. If you cannot amphibiously assault a territory using that transport, it cannot load ANYTHING that turn. Once the combat phase is over the transport can not move any further, nor can it load any units during the noncombat phase because it was used during the combat phase.
B) Leave the transport there, and it participates in the combat. It can retreat with other units, if the other units came from a different seazone. It cannot load anything from the hostile seazone, and because it was used (during the combat phase as a participant) it cannot load anything or move during the noncombat phase.