This would be possible only if the GDL Object is written in a way to enable that. I think these Objects are not written like that so it is not possible to modify the texture direction.
In such a case I would probably place a very thin (1 mm or thinner) slab or morph on top of the counter which would have a single texture.
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-Ac28