Question-and-Answer Resource for the Building Energy Modeling Community
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Here is a good thread on the subject.
how-to-model-underground-floors-in-openstudio
@nfonner the link above refers to a measure that sets boundary condition by story, but you could also have surfaces that fall below a global Z value changed to ground. While surface geometry is defined relative to the space origin, you can get transformation that gets global values taking account for space origins and rotation.
