Openings tab in model data under External Glazing headers
To include overhangs, sidefins and/or louvres check the 'Local shading' checkbox.
This shows the Local shading component data. DesignBuilder comes with a small database of Local shading devices, but if you cannot find a suitable component for your model, you can create a custom local shading component by clicking on the New button from the Selection dialog (below).
Note: the DesignBuilder Local shading devices allow a range of different overhangs, side fins and louvres to be defined, but if you need to model a shading device not covered by the standard mechanism, you can draw custom shading devices using Component blocks.