Create a Document Based on an Existing Document
The Problem:
I often need to create new documents based on existing documents, but it's not worth creating templates. Copying the relevant parts from one document to another saves some time, but not that much.
The Solution:
In any version of Word, open the document and use File 
Save As to save it under a different name or in a different folder. Change the new document as necessary.
Word 2003 and Word XP provide another way to create a document based on an existing document. In Word 2003, choose File New and click "From existing document" in the New Document task pane; in Word XP, choose File New and click "Choose document" in the New Document task pane. In the New from Existing Document dialog box, select the document and click the Create New button.