Eric S. yeah this happens a lot when you need a very specific sub-category like hardwood-only sawmills. clay gets you close, but not that precise out of the box.
best way is: pull a broad sawmill/logging list first, then run an AI check on each company’s website to confirm they actually mention hardwood (oak, maple, walnut, etc.) and exclude softwood-only companies.
it’s definitely doable with a domain-level classification layer.