On the General tab of the Modify DWG/DXF Export Setup dialog (see Exporting to DWG or DXF), you can specify options under the following headings:
Select the Export rooms and areas as polylines option if you want rooms and areas to be exported to a DWG or DXF file as closed polylines.
Select the Export rooms and areas as polylines option if you want rooms, spaces, and areas to be exported to a DWG or DXF file as closed polylines.
For rooms, the exported polylines match the boundaries of rooms in Revit. The room boundaries are exported onto a single layer, and that layer is turned off by default in the DWG file. The polylines include the following XDATA information for room boundaries: Name, Number, Occupancy, Occupant, Department, and Comments.
For areas, the polylines include the following information for area boundaries: Name and Comments.
Select the Make layers containing the following text not plottable option to mark as non-plottable any layers whose names contain the specified text. Note that the text box is inactive if the option is cleared.
If you want any Revit or DWG links in the project to be exported to a single file rather than to several files that reference each other, make sure the Export views on sheets and links as external references option is cleared. This setting establishes the default setting in the Export CAD Formats dialog when you export using this setup.