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Hey, Catalin—
I'm actually trying to figure that out myself right now. What I'm probably going to do (at least until someone answers your question better than I can) is use Multimenus 1, 2, and 3 to divide and display the choices that would normally be available in the Main Menu. Then I'll go to my admin page, select "Blocks" and make the Main Menu invisible.
I know that might not be quite what you're looking for, but it's a quick fix.
mongrel