Line Chain to Spline (3D)
When the 3D sketch is active, select lines, and copy to the active 3D sketch.
The lines which belong to the same tangential line chain form the single Spline Curve.
- On the
tab, in the Line Tools group, click 
Line Chain to Spline. - Select one or more lines.
- Select Confirm.
Note:
- A spline curve created this way includes an Identical constraint. If all selected lines belong to the same tangential line chain, the lines form a single spline curve, and a single Identical constraint. The number of Identical constraints matches the number of created spline curves.
- The spline curve is associated with the original chain of the tangential line, if the Identical constraint exists.