I would like to create a circular helix interpolation scanning toolpath for a profile as per attached image.

The tool to be used would be a Bull/Ball nosed end mill. 

Basically it should be a tilted helical interpolation toolpath that follows the surface.

What is the correct function to go to? I have tried Circular Milling and Isoparametric Machining but both of these are not able to generate a continuous movement from top to bottom, but instead creates a circular toolpath separated by Z levels, with approach and retract at each level.

I also tried Sweeping but am unable to make the tool axis work.