Create separate composites with different fills and attach different materials (with different textures if you use texture images) to the slabs when you place them.
You can set up favourites to choose these quickly.
Then you should be able to schedule the different grades and they should appear different in 3D.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11