I use AutoCAD civil 3D 2018 for my surfaces. When I export using the trimble link for AutCAD I can get the surface but cannot get any of the linework. When I save the Civil DWG to a regular CAD DWG i can get the linework but it all has 0 elevations on it. When I used Civil 3D 2016 I could expot a DXF and import into TBC and directly to my SCS 900 software on my trimble tablet. When will trimble update business center to be compatible with the new 2018 DWG format.