So what is the problem?
In the video I am seeing ARCHICAD doing exactly it is supposed to be doing when the "Subtract with Upward Extrusion" SEO command is executed.
Or do you have problems with the Material or Surface of the newly cut surfaces?
Do you want them to inherit the settings of the Morph? Then you should use the "Inherit From Operator" option.
Loving Archicad since 1995 - Find Archicad Tips at x.com/laszlonagy
AMD Ryzen9 5900X CPU, 64 GB RAM 3600 MHz, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac29
