Constraints - parallel lines distance dimension?

How do I set a distance dimension for two parallel lines?

I’ve tried with a rotated dimension perpendicular to a helping line but couldn’t really get it to work. The orientation of the rotated dimension does not update correctly.

How is that supposed to be done?

constraints_parallel_lines_distance_dimension.3dm (156.4 KB)

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There is an Offset constraint that should do what you want

Offset… of course. I must still do something wrong. Either I can’t add the offset constraint because of a conflict or the constraint is added and my four segment polyline goes into some sort of a self intersecting Z shape.