Thanks for your help. Sorry for gaps. It was my bad selection. I`ve uploaded my 3d model from which I took that edge.

I`ve attached image. Left is imported, right is manually created (points are in same places as vertex).
I`ve thought there is some way to convert that polylines to curve line to have points in place of vertices.

If I would convert edges to curves in that way then it should be easy to rebuild subd model in nurbs faster.
I don`t want to rebuild curve. I want to have my line points in place of my vertices. I would like to automate process a bit to not redraw every line from subd mesh.