You can use the Empty Panel type and place a separate custom family to represent those panel locations. You should be able to use the mullions you're already using for the boundary edges. You can also duplicate and modify the properties of the solid panel to match your custom panel (material assignment and thickness).
Most of the time we don't model the actual ceiling components. We normally just use the ceiling family type and use a pattern to imply the grid layout. Using the sloped glazing will also require custom families to represent every element that will need to be hosted within the ceiling. I understand that doesn't produce a grid for model coordination in Navisworks for example so I understand the motivation to model the ceiling more accurately.
Steve Stafford
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