Creating Beams with Vertical Curves / Cambered Beams:
I used the default NZ Structural Template for this example, but this should work with most templates.
1. From a Plan view, draw a new Reference Plane, and name it
2. Now click on "Set" from the "Work Plane" panel
3. Choose the Reference Plane created in the first step
4. Select an Elevation view as the parallel view
5. Using Model Lines, draw in the curved line
6. Click on the "Beam" command, and use the "Pick Lines" tool to select the Model Line created in the previous step
7. ...and you're done!!
Note that you could also have used a Grid element as a Work Plane, instead of creating a new Reference Plane.