Ramp handrail geometry help?

I’d like to use the sweep tool to generate a handrail for a curved ramp.
The ramp curve is a simple radius arc in plan view.
I know how to use the sweep tool. I am having trouble generating the 3-dimensional curve that defines the path.

Any geometry help?
I didn’t find a thread on this…if there’s one already, maybe just some help finding that…

(solved it myself…posted below for others)

select the edges of the curved ramp & use those to build the path