Setting the Units When Opening and Editing DWG Files
When you open a DWG file in MicroStation, use the DWG Open Options dialog to set the options for units. You can set two types of units: 1) Architectural and Engineering Units, and 2) Decimal, Scientific, or Fractional Units.
The units settings provide MicroStation with information to determine the linear units to use, and thus the true size of the DWG geometry. You can set unit values to Seed File Master Units, Seed File Sub Units, Design Center Units, or explicit unit values (for example, Inches or Meters).