Use File> Project Archiver to archive the project to your external HD and then open the project from there. if you only want the assets in your timeline on the external HD use the 'archive' option. If the project is a 'work in progress' and has assets not yet added to your timeline use the 'copy' option.
Cheers,
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Neale
Insanity is hereditary, you get it from your children
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