You can use your phone to call them and choose the option invite over.
Chat with our AI personalities
You go to your phone in your house and invite someone over then you choose the person you would like to move in with you and when they get there, if they don't reject you, you go to actions( when you click on them) and then there you go!!(: hope I helped
you have to go to a Sims house and click the phone and invite them over or you can let them invite you over by going to a group in downtown (nightlife needed) use the boolprop cheat then hold shift and click on the Sim and make selectable, then make the Sim take you and there friends to there house.
After you have cleared the ghosts out of your house and found someone who is always walking around with no place to stay(but make sure the sim your gonna invite cannot talk to you).They could be in deadtree, paradise place or division 47.Get your friendship and romance to level 4 with the sim,then go to your house and use your cellphone to invite that sim over. once they are over at your house...push the x button next to them and it will say invite roommate. =D that's all.
You cant
You go to "..." and click "edit town." Once you are in the town, click on the house you want to evict Sims from, and scroll over the three options. One of them is "evict Sims." choose the Sims you want to evict, and voila!