You can create multiple photo libraries to organize your photos, albums, slideshows, projects, and then switch between the libraries. The new iPhoto library you create will be empty. You'll need to export images from your original iPhoto library, and then import them into the libraries you just created
For example, you could keep separate libraries for your personal photos and your work photos. Following is the process how you create a new iPhoto library
- Quit iPhoto.
- Hold down the Option key as you open iPhoto.
- In the window that appears, click Create New.
- Type a name and choose a location to store the new photo library.
- Click Save.
The iPhoto Source list shows your new, empty photo library. Any photos you import are added to this library.