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If I understand correctly, you are trying to model two areas of the same building story where the ceilings are at different heights. As an example, let's say that you have a corridor with a ceiling height of 10' above the floor that leads into a foyer with a taller ceiling height of 15' above the same floor. To model this in OpenStudio, use the following process:

1. When you draw the shape of the floor plan for the building story, use a line to separate the corridor from the foyer.
2. Use the "Create Spaces from Diagram" tool in order to create 3-D spaces for each portion of the floor plan. This tool asks for a floor-to-ceiling height, so use it once for the corridor with 10' height and use it again for the foyer with 15' height. Refer to the Envelope section of the OpenStudio documentation for more details.

If your question is about making different ceiling construction assemblies with different thicknesses, then make two different Construction objects and combine the appropriate Material objects for each layer. Refer to the Constructions section of the OpenStudio documentation for more details.