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The suggestion to explode the non-coplanar polylines actuallly can work (but usefuleness of the result may still vary) - but it requires another step.
The procedure is:-
- Explode the non-coplanar polylines back to line segments.
- Select all the resulting line segments and open the Properties panel.
- Set the Start Z and End Z values to 0 (if these show up as 'varies', then you'll see why AutoCAD is complaining about non-coplanar lines).
- Use the command PEDIT>Multiple followed by Join to re-combine the line segments into a polyline.
There may still be issues with the resulting polyline though even if AutoCAD happily created a single polyline from the resulting pile of lines.
For example, lets say that you wish to hatch the resulting polyline (if it is closed) - AutoCAD may allow you to select the closed polyline as a hatch boundary, but may refuse to display the resulting hatch when you try and preview the hatch or if you just accept the result and complete the hatch command.
This may be a result of using PEDIT>Multiple followed by the Join option to recreate the polyline as this allows the specification of a 'fuzz' precision which implies that the resulting polyline might be acceptable enough to have its closed property set to TRUE, but may not be good enough for the Hatch method to actually fill the resulting boundary.
I discovered this when trying to form up a hatched area from polylines that were originally created in Civil 3D from sections through surfaces so use this method with a bit of caveat emptor.
Regards,
Glenn