What do you need to use them for? You can sketch on a plane offset from the sphere and then use the Project Curve or Split Line features to put the sketched entities on the sphere. The first puts sketched entities on the face. The second actually splits the face along the lines of the sketched entities into multiple surfaces.
Spline on Surface
Well, I am trying to create holes on a ball. I do admit I am not that advanced but tried the spline on surface but did not work.