Hi @Juliet,
You cannot create columns at file / folder level. Columns can be created at document library level or content type level.
You could consider following solutions
- Create separate document libraries for different type of documents (teams/groups) to have different metadata / columns
- Create separate content types for each team/group (inheriting document content type) >> add different columns to each content type as per your requirements >> add content types to same document library >> use custom content types to create documents.
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