Redmine

Enumerations gives possibility to create new category of document. Let say we create new enumeration "document X'.
But, creating new custom field (Custom fields->documents) gives NO possibility this field is visible only in "document X".

Any way to make it works as it should? I mean if I create new document category (new enumeration) so I can then create custom field and assign this field ONLY to this document? NOT for all documents.