How to set room to u/s of ceiling

Can someone please let me know if there is a way to set my room boundaries to be at the same level as my ceiling with Dynamo?
I am fairly new to Dynamo and I’m trying to figure this out

Not sure what you are after, but it sounds like you want to use your ceilings to ‘cap your rooms.

Enable volumetric room calculation in Revit and then set the room height to your floor to floor heights or other big number. The room should ‘crop’ to the ceilings/roofs automatically.

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