iMovie
on your Mac, choose File > Open Library, and choose an option from the submenu.You can choose from recently opened libraries, locate an existing library on your Mac, or create a new library.
The selected library is opened in the on your Mac, choose File > Open Library, and choose an option from the submenu.
You can choose from recently opened libraries, locate an existing library on your Mac, or create a new library.
Select the project you want to move or copy.
Click the button to the right of the project name, then do one of the following:
Copy the project to another library: Click Copy to Library, then choose a library from the submenu.
Move the project to another library: Click Move to Library, then choose a library from the submenu.