To Export Levels
From the Level Manager dialog, Levels menu, choose Export.
The Export Levels dialog opens. This is a standard file selection dialog.
Select the DGN to export to, or select an existing DGN to overwrite.
You can export only ".dgn", ".dgnlib", ".csv", ".dwg" and ".dxf" files.
The levels in the open DGN file are exported to the library. If you entered a new library name, it is given a ".dgnlib" extension.