Create a floor and try
Roi G. | AUTODESK REVIT & DYNAMO EXPERT
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You could model main roof and dormer as one single roof.
If your dormer and main are two separate roofs then you can use opening by face or vertical cut opening to cut 2 hole in the main roof where the dormers are (even though the dormers already cut the main roof) so that the room volume can spill through the holes to fill the space under the dormers.
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