Enable the creation of a new document based on an existing document - making a copy of the original document. This is useful for longer documents instead of copy/pasting all the content. It's fundamentally the same, technically, as creating a document from a template, which is also required (but is a different use case).
Suggested way to implement: Create a 'Create Copy' function in the Workspace or Search Results page, to create a new document which is a copy of this. Doing this in the 'Create Document' dialogue would require a similar search function to the one in the Workspace, so more difficult to implement that way.