You could use NWCOUT, or…

Steps:

  1. At the command line, type MENULOAD.
  2. Press Return.
  3. In the Load/Unload Customizations dialog box, click Browse.
  4. In the Select Customization File dialog box, change the Files of Type to Legacy Menu Template (*.mnu), and browse to the Autodesk Navisworks menu file.
    Note: For AutoCAD 20xx based applications, this file is located under C:Program FilesCommon FilesAutodesk SharedNavisworks2015NWExport20xxlwnw_export.mnu. So, for example, for AutoCAD 2015 based applications, this file is located under C:Program FilesCommon FilesAutodesk SharedNavisworks2015NWExport2015lwnw_export.mnu, and so on.
  5. Click Open.
  6. In the Load/Unload Customizations dialog box, click Load.
    The loaded menu is shown in the Loaded Customization Groups.
  7. Click Close.

Note: you may have to load this from a trusted location to avoid security problems.

From:
Help: To Load the Autodesk Navisworks Export Menu in an AutoCAD-based Application