Export 3D .dwg to .sdn format

We have a customer who wants us to convert one of our AutoCAD 3D models to .SDN format (Steel Detailing Neutral format). I am not familiar with the software they are using, SmartPlant 3D 2009.1 . I also understand that they also use Bentley Structural and ProSteel as well.

Does anybody have any suggestions?

Original File is AutoCAD 2012 .dwg format, 117,285 kb in size.

Thanks.

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