A project's source media items--video clips, audio clips, and still images--are not stored inside a Premiere Elements project file. Instead, clips and images exist as separate media files (video files, audio files, or image files) on your hard drive.
When you select clips or images in the Project view of the Tasks panel in Premiere Elements, you can press Delete or Backspace to remove those items from the project, but the actual media files for those items remain on your hard drive.
Follow the instructions in this section if you also want to delete one or more of the media files. (You may want to delete media files to reclaim the disk space that those files use.)
Note: This section is optional. If you want to delete a project without deleting its media files, then go to Delete a project file and scratch files below.
Important: Delete a media file only if you are certain that you do not need it currently and will not need in the future. Because Premiere Elements does not store media files inside project files, deleted media files are not available for you to use in any Premiere Elements project or in any other programs on your computer.
To delete a project's media files: