You can't permanently delete a Sim without deleting the entire family from the game.You can make them temporarily disappear, but how to do that is for you to figure out.
You cant delete a especific sim or sims. You have to delete the whole game. To delete a game you just have to save another game on top of that game.Use a cheat. ctrl shift c and type in moveObjects...
On My Sims DS you can't delete furniture but you can sell it - go to a furniture store or general store and they may buy it off you. Hope this helps :)
type the boolProp testingCheatsEnabled true cheat in the cheat box. then type moveobjects on. then go to the furniture icon and click the Sim you want to delete. and presto!! you have successfully...