@MRoberts8 thanks for elaborating. In that case, correct, this can currently not be done. It’s not possible to configure conditions based on the deal stage.
There might be a workaround by copying the industry value to a clone of that field via a workflow, once it’s known. This would not trigger the dependent field and you could make that field view only in Enterprise, reducing the risk of it being edited. In the closed deal stage, you could make it required and set up the conditional field based on this clone.
I haven’t tried this but it might work.