To Export a DGN File to the JT File Format

Open the DGN to be exported.
Select File > Export > Exchange File Types > JT Format (*.jt) .
The JT Exporter dialog opens.
(Optional) Add a suffix to be displayed at the end of the master file name and all reference file names.
Click the View button and select the view you want to export.
(Optional) Select Export All Entities to Master File to include reference DGN files in a single JT file.
Review the Export column. Place a check mark next to the files that you want to include in the exported file.
Tip: You can click a column header to sort files in ascending or descending order.
On the JT Options tab, select suitable options for how you want to export the geometry.
Click OK.