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While Document classes allow you to create the fields you want to appear in your document(s), Categories allow you to define the values your users can select for those fields when creating or editing a document.
You must create a new Category list value before adding a Document parameter property to the Document Class with the new Category as the Field type:
For more details about how to create categories, please refer to AODocs' documentation: https://support.aodocs.com/hc/en-us/articles/205749386-Create-categories
