Before exporting a model to DGN, you can create or modify an export setup to meet your needs.
For detailed information on the mapping behavior of Revit dimensions when they are exported to AutoCAD dimensions, download this file: Export Behavior of Revit Dimensions.
To customize an export setup
- Open the Modify DGN Export Setup dialog using one of the following methods:
- Click File tab
Export Options
(Export Setups DGN).
- Click File tab ExportCAD Formats
(DGN). In the DGN Export dialog, next to Select Export Setup, click
(Modify Export Setup).
The left panel of the Modify DGN Export Setup dialog lists all existing export setups. Settings for the currently selected setup display on the tabs. Use the following controls to manage setups:
New Export Setup. Uses default settings. 
Duplicate Export Setup. Creates new setup using settings from the currently selected setup. 
Rename Export Setup. Prompts you to specify new name for currently selected setup. 
Delete Export Setup. Deletes the selected setups (except for the default <in session export setup> which cannot be deleted). - Click File tab
- In the Modify DGN Export Setup dialog, for Select Export Setup, select the setup to modify, or click
(New Export Setup) to create a new one.
- Specify export options on the following tabs as needed.
- Click OK.