Two approaches come to mind:
1. Experiment with Pen Sets. Save two Views of the same Elevation. Use one Pen Set in one and use another (a black and white or grayscale) Pen Set in the other.
2. When you place a View on a Layout as a Drawing, you can then select the Drawing and go to its Settings Dialog. There in the Properties panel you can select either Grayscale or Black and White in the Colors field. That might also work.
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-Ac27