is there a way to model dormers in beopt?

edit

There's no way to create a model that looks exactly like one, but to create a model that accounts for the added wall area and knee wall space (conditioned to attic) I've previously used something like the following: Living space/dormers on the sides, unfinished attic (knee wall) in the back, and finished attic in the front. Adjust size and shape to suit your needs.

The most important heat transfer occurs from the dormer's windows. I'd suggest adding the dormer window area to the main window area for the home (in the Window Areas category on the Options Input Screen), so that the appropriate heat loss occurs for the conditioned space.