OpenStudio Window Merging Problem

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Hello,

My team and I are working on a 4-story hospital building energy model. We created the geometry using FloorSpaceJS and Sketchup. The geometry is fine and in working condition; however, whenever we try to create windows - it does not allow us to create new windows without selecting all the windows. So, if you delete one window, it deletes all of it. This prevents us from being able to merge the windows into the model. Is this a bug that can be fixed? Or is our model getting too large for the software's capability?

Any leads on this would be greatly appreciated.