Nastran reference manual : Line-Projected-Pressure

MENU SEQUENCE:
Data → Loads → Static loads

This condition is very similar to the previous one. The coordinate system works the same way, based on the Line-Pressure-Load.
The only difference is that the total load applied to the beam equals P*L*cos (alpha) in the Y-Basic direction, where alpha is the angle of the X-Element axis with respect to the X-Basic axis. (See the two previous figures).
Comment for NASTRAN advanced users: It is not necessary to mesh to assign this condition. It can be assigned directly over lines of a structure.