You need the Vampire Creation power. It costs one power point, it's in the second row starting from the bottom, and it's at the right end of the row.
Vampire only has 5 levels: Fledgling, Minor Vampire, Prime Vampire, Master Vampire, and Grandmaster Vampire. If your Sim is a level 5 vampire (Grandmaster), he should be able to get any power as long as he has enough power points and it doesn't conflict with his weaknesses. If he's out of power points, he can earn more by gaining bonus ranks or drink a Draught of Reconfiguration to change the powers selected. The Draught of Reconfiguration is unlocked at Vampiric Lore level 14 and is made at a bar.
