Floor Loads Applied Perpendicularly to a Sloping Roof

Question

Hi Sirs, 
 
 1) Is there a way to apply floor loads perpendicularly to a sloping roof? 
 2) What is the use of Inclined Floor check box in the floor load feature of STAAD? Is it to perpendicularly apply the loads on a sloping area? Because I tried switching it on and off but the angle of the load doesn't seem to change. Please see the pictures below.

Thanks!

AndrejLogunov · Answer

Hi Eren Jaeger, This option must be used when a FLOOR LOAD is applied on a set of members that form a panel(s) which is inclined to the global XY, YZ, or ZX planes. To control the load direction, please assign the floor load to Floor group and check the One way distribution drop down list "Towards". Then select the appropriate beam to orient the loads in that direction. 
 Regards, 
 Andrej