You can create composite curves by projecting multiple wireframe objects or highlighted edges onto:
To create the projected composite curves:
Along principal axis — This projects the wireframe along the principal axis onto the selected objects.
If no surfaces, solids, meshes, or components are selected, the wireframe objects are projected onto the principal plane.
Through item — (Valid only when surfaces, solids, meshes, or components are selected.) This projects the wireframe through the objects along the principal axis. A new curve is created on each surface that the wireframe touches.
Along item's normal — (Valid only when surfaces, solids, meshes, or components are selected.) This projects the wireframe onto the selected objects along the surface normals.
The new composite curves are dependent on the underlying surfaces if projected onto objects.