I typically use 3D Document for developing Roof Plans. This method won't create the dashed lines (for roofs below) like you're trying to achieve. As far as I'm aware, those would have to be drawn with 2D lines or polylines.
iMac 27 (2020) 3.8 GHz Core i7; 128 GB RAM; Radeon Pro 5700 XT 16 GB GPU (macOS Sequoia)
MacBook Pro M1 Max; 64 GB RAM; 32-Core GPU (macOS Sequoia)
ArchiCAD 28/27/26/25 Full (back when Full used to mean Full) (latest builds). User since AC12 (2008).