How would I go about transferring an iMovie project from one Mac to another?

I’m working on a video and the MacBook I’m using doesn’t have enough space to produce it into a complete file. Hence, I want to move it over to my iMac so that I can finish it up and turn it into a DVD. I’ve already tried putting the “iMovie Project” file onto a flash drive in order to move it, but the iMovie on my iMac won’t open it. Any suggestions?