I did using 3D Document with parallel projection on the top. I moved to Worksheets, where I got the fill corresponding to the real projection.
Then, in the Projects Map, based on the fill, I did the editing of the slabs.
Perhaps there are ways more accurate, but I tried this way and the result was satisfactory.
Sorry for my English, I'm learning this language yet.
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Murilo Noleto
http://www.kilobim.com.br/
AC 12 - 27 | Win 10 | 16GB | NVidia GTX 1050Ti | AMD Ryzen 7 1700X