Typically the frame effects of the window can be simulated without using the "WindowProperty:FrameAndDivider" object in EnergyPlus by modifying the airspace thickness. However, if you interested in the effect of condensation on the frame in very cold climate or in high humidity climate, you need to model the window frames. In the Openstudio plug-in v1.5.3, there is a place to add "Frame and Divider Name" in the "OS:SubSurface" object, but no place to describe the frame.