Depends what you classify as 'partners'
I don't think you can, but they can move in with you if you are partners or best friends.
You can't get anymore than "Partners".
I m already made them Partners and made them move together and I m in level 10
cause its messed up.
get them to become partners
Get them to break up with their old partners first.
There shouldbe a propose option, life time relation might need to be > 90 i don't exactly know.
You need to become more romantic with your partner :D
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You get the man sim or girl sim to be romantic then once their partners then they can woohoo