Change a document auto-numbering scheme.
Changing a document auto-numbering scheme won't affect any document numbers already assigned to documents under the scheme.
Schemes can be created using document fields only or using a combination of both document fields and project fields that you've applied to your document types. Learn more about creating autonumbering schemes.
Things to note:
Autonumbering schemes cannot be deleted, but you can remove all Document Types from a scheme so it has no effect.