To Export a Visible Edges DGN File

Open the Export Visible Edges dialog ( File > Export > Common File Types > Visible Edges (*.hln) ).
On the General tab, choose the view number from the View option menu.
Do one of the following:

(Usually recommended) To create a visible edges DGN file, set Export To to 3D File or 2D File.

or
To place the visible edges in the active DGN file, set Export To to Active File.
Adjust other settings as desired.
(Optional) To preview the result, click the Preview button.
Starts the hidden edge removal process with output directed to the view specified in the View control.

If you are dissatisfied with the preview image, return to step 4.
Click the Export button.
The Save Visible Edges Design File As dialog opens. By default, the visible edges file is given the same filename as the active design file but with the suffix ".hln."
(Optional) Change the filename and/or choose a different directory.
Click OK.
Tip: You can export multiple visible edges DGN files using key-ins.