Install with some packages from stable and some from testing

["Randolph S. Kahle" <RandyKahle@KahleAssociates.com>]

I am running the stable release on my machines. 

I would like to run the more recent version of Samba (as found on
testing).

Is it possible to edit the /etc/apt/sources.list file and use apt-get to
install just samba from testing and leave the rest of the packages at
the stable release?

What steps would I take to do this?

Regards,

Randy