ragingloli: I think there is some info on the wiki article about Subsystem(s), but it's mainly an issue for whoever does the pof conversion.
Basically, though, you can tell the engine to only draw certain parts if the camera is within a certain AABB (axis-aligned bounding box) in the model's coordinate system. This is useful for things like long fighterbays that are only visible from inside or at the end(s), or big chunks of greeble-heavy stuff that are only visible from one side, or which are so large that only part of it should be drawn at full detail at any one time.