You can do it with a Roof Face object.  All you need to do is set the pitching line at the top edge of the roof.       You can get different effects by changing where the pitching line is:  - Everything below it or at it will have your set eaves treatment.   - Everything above it will have a vertical edge.   Skillion roof with square cut top edge v2020.vwx     Skillion roof with square cut top edge v2019.vwx
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