Get a material take-off for the selected set
Material take-off on a set
Why it matters. A material take-off schedule is a second table, usually for the whole model. You wanted concrete in these walls, not the project.
What VI MCP does. Take-off on the found set. Changing a material’s colour is appearance. Compound-structure layers are the type build-up, not this take-off.
Try this prompt
“How much concrete is in these foundation walls, by material?”