How to make slope & cross section rotation on structural beam

[arkbimswk]

Hi all, 

Im working on a structural beam & i need to slope it 1 side -150mm. But facing problem because:

1. Not all the beam across the grid line (G9 to 11) are connected. Some of it have 3 different depth size so i placed it differently.

2. Facing problem to "cross-section rotation" feature. how do i make my beam rotate -150mm?

I attach pictures.

1st picture- Area i need to slope it -150mm. Run vertical & horizontal
2nd picture - 3 different depth of beam. Not connected to each other. how to calculate to make sure all those beams are perfectly same slope -150mm.

3rd picture - Beam that i need to cross-section rotation. 

Thank you so much guys!!