How to import dwg polyline wholly with object property

I’m trying to make builidng mass with dwg polyline having height property. but ‘CAD.CurvesFromCADLayers’ i’m using, explode all polyline and give ‘line’ geometry.
i want to import dwg polyline “wholly” and get there height property. how can i do??

Best to open the DWG in civil 3D, and convert the polylines and heights into Dynamo serialized data using a Data.Remember node or external json file.

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