Use the options on the Wireframe tab > From Selection panel to create curves from a selection of other objects, such as surfaces, solids, meshes and components.
You can create the following curve types from selected objects:
Draft Curve
Outline Curve
Spun Profile
Intersection Curve
Oblique Curve
Projected Curve
Wrap:
Wrap
Unwrap
Trimline
Note: The availability of Wrap functionality is license dependent.