Moving Load - STAAD PRO

I need help in STAAD PRO. I am trying to get a moving load to go from one node to another.

For example, if I have nodes N1, N2 and N3,  and member M1 runs from N1 to N2, while member M2 runs from  N2 to N3. How do I get a moving load to move from member M1 through M2, going from the first node to the last node?

Note: The beam orientation is not on any of the global axis, and therefore I dont think I can use the incrememnt option in the load generation menu, since it only increases it in the global axis.