
Use the Line command to create 3D sketch segments. Line segments can be joined with 2D sketch geometry copied to the 3D sketch with the Include Geometry command.
Create a 3D line with or without bends.
After sketching lines, add dimensions and constraints as required to stabilize the line size and shape.
In an assembly, create a separate part file to contain the 3D sketch, adaptive work features used to position the path sketch, and the resulting 3D sweep feature. Use the Include Geometry command to copy model edges and 2D lines and arcs from other parts. Included geometry is converted to 3D sketch geometry.
Sketch panel
Create 3D Sketch
.
Draw panel
Line
. Clear the Auto-Bend check mark to disable automatic bends. The context menu changes the Auto-bend setting in Application Options.
If necessary, use the Include Geometry command to copy geometry to the sketch.

Options panel
Application Options
and on the Sketch tab clear or select Auto-bend with 3D line creation. To set the default Auto-Bend radius, click
Tools tab
Options panel
Document Settings
and on the Sketch tab enter the value in the Auto-Bend Radius box. Use the context menu to turn Auto-Bend on or off.