How to split Aperture library to have a part on an external disc
I found that my Aperture library occupies over 200 GB and for actual use I need hardly half or less. I have many folders and many projects within them. What would be the easiest way to transfer a bigger part of it to an external disc and to see the photos when the external disc is connected ? Or any other idea ?
MacBook Pro with Retina display, OS X Mavericks (10.9)