I has changed the link.
With the CAD Document open in session, perform the following:
- File > Save a Copy
- Select required file format in the Type drop down list
- Deselect the option Save new files to Model's CAD Document to save the file as independent file in Workspace
- Select it to store the file as attachment
- One may use the config.pro option dm_save_as_attachment to control the setting of the option Save new files to Model's CAD Document