How to Add Clips to Your iMovie Project
Accept or Reject video segments.
iMovie 09 features Favorite and Rejected frames, allowing you to view and use your best camera work (and ignore the worst stuff). To mark a video, select a range of frames or an entire clip and then click the Mark as Favorite button in the Editing toolbar. Click the Reject button to hide the selected video or frames from view. (You can always unmark a Favorite or Rejected scene using the Unmark button in the Editing toolbar.)