You cannot create vampires in The Sims 3 on Xbox 360. The Late Night expansion pack—which adds vampires, celebrities, apartments, and nightlife—was never released on consoles. Console versions only received the base game.
testingcheatsenabled true unlocks hidden objects/debug items but no vampire mechanics.The Sims 3 console ports (Xbox 360, PS3, Wii, DS) are base game only. No expansions, no store content, no mods. For the full experience (Late Night, Supernatural, Seasons, University, Island Paradise, Into the Future), play on PC/Mac via Steam/EA App/Origin.