Common law

Guys,

My immigration takes too long, after my interview waved 2 years ago, Buffalo asked me for an interview. I have been living with my girlfriend for at least 3 years in Canada, and she is a landed immigrant.

My question is: can I present some documents to show the interview officer that I have a law partner?

If yes, what should I bring? I here ***** said partners can go to some agency to declare to be common law partners in Canada, is it true?

Thanks a million

(for guys applied through Buffalo, be patient).