A modeling question -Noob

Creating a jet and its engine seperately.

for example I create a jet engine and I save it and start a new session
to create the rest of the Jet.

Ok so then the jet is created and I want to add the engine to the Jet.
How do i take the jet engine from my save file without shuting the session which has the rest of the Jet ?
If you could link me to a tutourial or tell me what. Id really apreciate it.

look for tutorials bout append …

I recently asked a similar question. this is the thread. The video helped a lot. You’re looking for appending/linking (similar methods with slightly varying results depending on your need).

http://blenderartists.org/forum/showthread.php?t=173893