Export an iMovie project to QuickTime to import into another iMovie project I have iMovie '11 and wish to export an iMovie project to a mov file that I can import into another iMovie project. How can I do this?
Open the project, then select Share → Export Movie.

Select a destination and other options if relevant, then select Export. Once the project is exported, you can import it just like any other video.

More information: iMovie ‘11: Export your movies to a Finder folder