At the moment, when exporting Sample Line Groups to 2D AutoCAD in Project Explorer, only Sample lines and cross-section views are exported to AutoCAD DWG (Project Explorer Help - About Generating AutoCAD Drawings).
It would be great if the Project Explorer option to "Quick Export to 2D AutoCAD DWG" for Sample Line groups also could export Material Volume tables for each cross-section view, as they are strictly connected to the view.
Currently, tables can be only exported when exporting the whole drawing to AutoCAD DWG in Civil 3D