Multi building OpenStudio plug in

Good evening , if anyone knows how to help me , i am trying to build a building with ground floor and first floor for energy simulation. The two floors have different occupancies so i make them separately , follow surface matching separately and then i join the floors but the occupancy lines of the first floor keep getting confused with the ceiling of the ground floor. does anyone know how to prevent this from happening ? thanks to anyone who answers

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You should learn about how Groups/Components and Tags work with the software.
They are fundamental to understanding the software.