When trying to dimension a scaled reference drawing the dimesions arenot correct they are not scaled to the reference file.
MicroStation V8 2004 Edition:
Element > Dimension Styles > Placement > toggle on Reference Scale:
MicroStation V8i (Select Series):
Element > Dimension Styles > Units tab > toggle on Reference Scale
MicroStation CONNECT Edition:
Drawing workflow > Annotate > Dimensioning tools > click the little arrow to open Dimension Styles > Units tab > toggle on Reference Scale: