I need help : a library for midi files like audio files?

Hello everyone,

I need help. Is it in Cubase 7, a library for midi files like audio files? If I want to keep a midi file in its entirety before the change, what do I do? I know that I can export, but there is certainly something faster and easier to manage. In Pro Tools, each modification of midi file creates another file named automatically, but in Cubase, I do not know. :question:

No help for this issue?