do they open different blocks of tickets...

at different times within the fanclub presale? I'm checking Nassau all i'm getting is section A1 and C1 which is the right and left sides of the stage respectively....however, there's nothing coming up for B1 which is in the center on the floor....do they hold certain sections for different times or what? Also, i've been looking for floor seats at the Meadowlands and nothing has been open....