If a pen table contains a pen map section, the pen maps can be exported to an AutoCAD CTB file by selecting Modify Pen Table dialog.in the
When a CTB file is exported, MicroStation writes only the data relevant to the pen map section. Other pen table resymbolization actions, such as end caps, line joints, patterns, and the like, are not exported to the CTB file.
If a CTB file is imported into the pen table and then exported, the extra data that MicroStation does not modify is preserved. This must be done, however, in a single pen table session.
MicroStation does not store any "unrecognized" CTB data in a pen table file. The topic Saving a CTB/STB file to a pen table provides more information on exporting these files to a pen table.
MicroStation cannot export to an STB file.