Question: 3D surface with curves

I have succeeded in generating a nice plot of a surface in which I am interested, and have calculated geodesics on the surface. Is it possible to display one (or more) geodesic curves on a 3D plot of the surface? If so, would someone point me in the right direction to do so. I've looked at "multiple", but don't see how it's applicable to my problem. Don Ritchie
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