Have you already tried fixed contour with drive curve?
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Hm.... My chance to understand topic starter, I will use telepathy.
If you see a picture - topicstarter want ZIG-ZAG. In this case - Variable Contour, Surface Area as drive method. Surface? Extrude 3D spline or Swept, Or By curves, etc - depends what topic sterter want.
i wan to make -z steps in zig zag , and only have a curve, thx
I can get Zig by turning on multiple depths. The trick is that this requires part geometry, so you need to also select the spline as part.