Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Since there is a comment character limitation, I am posting this as an answer. You can model attached shading surfaces (overhangs/fins) using the Shading:Zone:Detailed object which also provides the option of defining a transmittance schedule that could replicate the activation of your shading similar to the post I mentioned in my previous comment (Post). The question is what sort of technology are you trying to model, this can help in determining the equivalent transmittance value that will mimic the specific intermediate state of your shade.
The transmittance schedule option should work for attached shading surfaces (e.g. overhangs/fins), if you want to model other types of shades such as exterior blinds/shades then you can check the answer posted by @Ag.
Side note: I think you can use the Shading:Building:Detailed for the same purpose although it is meant to be used when defining a detached shading surface. Others can confirm this!
