Newbie One Hard Disk Two OS X How To?

I am a long time Windows User, but newbie on OS X

This is a wonderful OS I use.

I have a macbook pro with 500GB HDD inside.

I want to one HDD install both OS X 10.8.5 and OS X 10.10.2, plus one more partition for save data, so when as need, I format any two OS X partition will not data lose... (So Total 3 partition base on my case there).

But I search APPLE official KB, not find any document as example like my case, just only see how to install the OS X on ext HDD only (Not the way I want to be).

So .... anyone can tell me how to do above? OR can it?

MacBook Pro, OS X Mountain Lion (10.8.5)