Z-Value for curve/line

I have a contour line located near a specific spot(point) For example, my point is set at a z coordinate of 20.54 and I want the adjacent contour line, which is 5ft away, to be set at that same elevation. I select the contour line but there does not seem to be place to input the specific z-value.

I was thinking that in object properties there would be a z-value box that I can type into.

For instance, in Sketchup I can select a line then move the cursor over an adjacent element. The selected element will then be set at the same height as the element Iā€™m floating the cursor over.

Hello - use SetPt > Z only to force a curve to be planar in Z at a particular level.
(Transform menu > Set XYZ Coordinates)

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Thank you.