During the Rose model import process, mapping subunits to existing
UML 2.0 models is helpful when you have several Rose models that refer to
common subunits. When you create independent models from subunit files, on
subsequent import sessions you can map Rose subunit files to existing model
files that were originally Rose subunits.
Note: If your Rose model does not
contain subunits, or you do not want to import them as separate models, click Next to
advance to the Map Property Sets page of the Rose
Model Import wizard.