How do you get a sim from university to move into your normal world

In Sims 3 University you can change the lot type from a community lot to a residential lot (my sim started dating someone in a frat when she went to university). Once the lot is converted into a residence you can split up the household. I removed my sim's boyfriend from the frat house and I placed a copy of the desired sim from the university into my library then returned back to my hometown where I placed the copy of the sim into his girlfriend's house, in which he became a playable sim. The only downside is they have to restart their romance, however at least they can finally marry.