As you progress through Story mode, you will unlock Bonus attribute points in the Create a Superstar mode. Although you are rewarded bonus points, no more than 250 points can be used on a CAS that will be used in Story mode. You can always reduce the attribute points to enter Story mode.

Complete WWE Development in Story mode - 400 points
Complete Sunday Night Heat in Story mode - 600 points
Complete Story Mode - 800 points
Beat Story Mode Twice - 1000 points