You asked and we listened. With Vectorworks 2013, we've added several improvements and capabilities to the DXF/DWG import and export process that will dramatically improve the interoperability process.
Now you can export Vectorworks 3D objects as 2D flattened graphics in the DWG model space.
A new command lets you do a batch export for DWG/DXF from multiple files at the same time.
A new option allows you to make 2D and 3D conversion resolution adjustments during DWG/DXF imports.
A new option lets you choose true (RGB) or indexed colors on DWG/DXF exports.
A new DWG/DXF import feature improves the speed of your imports by alerting you when complex hatches with multiple boundaries are found. This alert gives you the option to skip importing the hatch, convert hatches to lines, or proceed with the import.