There is a conversion factor you can use on import. The following comes from the program help.
Factor
A coordinate conversion factor – the multiplication factor to be applied to drawing coordinates to produce coordinates used in the analysis. If, for example, the drawing is in mm and the Microstran model is to be in meters, the factor would be 0.001.
Factor
A coordinate conversion factor – the multiplication factor to be applied to drawing coordinates to produce coordinates used in the analysis. If, for example, the drawing is in mm and the Microstran model is to be in meters, the factor would be 0.001.