Surface Import Settings Dialog Boxhttp://knowledge.autodesk.com/support/autocad-civil-3d/learn-explore/caas/CloudHelp/cloudhelp/2015/ENU/Civil3D-DataTranslation/files/GUID-041C216A-DFF0-4234-91F6-2AD0E230D0B9-htm.htmlTo Export Surface Data to a LandXML Filehttp://knowledge.autodesk.com/support/autocad-civil-3d/learn-explore/caas/CloudHelp/cloudhelp/2015/ENU/Civil3D-UserGuide/files/GUID-1E79303D-C417-4BF2-A533-A5F8222EF840-htm.htmlAbout LandXML Import and Exporthttp://knowledge.autodesk.com/support/autocad-civil-3d/learn-explore/caas/CloudHelp/cloudhelp/2015/ENU/Civil3D-UserGuide/files/GUID-C77216E8-09FA-4D63-8182-400E9C2DB0A4-htm.htmlExport Surface to LandXMLhttp://envisioncad.com/video-tips/exporting-civil-3d-data-to-landxml/