Currently Being ModeratedMay 5, 2012 2:38 PM (in response to profftin)
First, share your project using SHARE/EXPORT USING QUICKTIME. Choose "Movie to QuickTime Movie". Choose Apple Intermediate Codec for the video format. Make the dimensions the same as your event clips.
Save this someplace you can find it.
Now import the movie you just shared into an iMovie Event using FILE/IMPORT MOVIES.
You can now use it in any project.