turn 2d polyline into 3d

[ayacos]

Good morning to all,
do you know how to tell me if it is possible to turn 2d polylines into 3d polylinees?
I apologize in advance if I wrote in the wrong place but being new I still have problems.
Thank you.

 

[PlannerRoad]

subject already dealt with:
http://www.cad3d.it/forum1/showthread.php?34191-trasformare-polilinee-2d-in-3d
http://www.cad3d.it/forum1/showthread.php?20912-come-trasformare-polilinee-in-polilinee-3d

 

[GP.]

to consider also the good old pedit3d, which manages to approximate the curves.http://www.black-cad.homepage.t-online.de/pediten.htm