2011

Export mapping setup: If you have accessed the Modify DGN Mapping Setups
dialog box by creating a new setup from the Export DGN Settings dialog box,
the DWG column includes all defined linetypes in the current drawing file.
Whenever the target cell is blank (right-hand column), we will use the default
system mapping.
You can directly type DGN linestyle names in the cells in the right column.
If unknown linestyle names are added to the right column of the mapping
table, they are ignored and default to Continuous.
Import mapping setup: If you are in the Modify DGN Mapping Setup dialog
box by creating a new setup from the Import DGN Settings dialog box, the
DGN column includes all defined DGN linestyles in the imported DGN file,
as well as the DGN seed file used when the DGN file was created.
When remapping linetypes in the DWG column, only linetypes from the
acad.lin and acadiso.lin files are supported (depending on Units or
Measurement type of file). Linetypes stored in custom LIN files are not
supported.
Lineweight
A predefined set of lineweights is displayed which provides the best match
between lineweights used in DGN and DWG files. You can copy and paste
single or multiple lineweights using the right-click menu in the right-hand
Modify DGN Mapping Setup Dialog Box | 565