If you use Versions (File + Versions) to store multiple versions of a document within a single file, then it will only be a matter of time before your document corrupts and you lose all your work. Avoid this feature like the plague - and like Fast Save and Master Documents, which are similarly broken – unless the document is of no importance to you. Taking backups won't necessarily help, because the corruption may creep up on you gradually, and by the time you realise you have a corruption you may have to go back to a very old file to get a clean document.
Restart numbering manually with the Restart Numbering command. This is the 'out-of-the-box' method of restarting numbering, available from Word 2002. It sets a rather mysterious 'restart marker' as direct formatting on the first item in the list, which can cause problems if you copy and paste list items, reapply/reset styles, or change style definitions.
You can't use Word's Numbering feature to generate a multilevel numbering system, even if you use built-in heading styles. Figure A shows a document with two styled heading levels: Heading 1 and Heading 2. You can apply the Numbering option (in the Paragraph group) and Word will number the headings consequently, but the feature ignores different levels; if you expected 1, 1.1, 2, 2.1, and 2.2, you might be surprised. If you select the entire document first, Numbering not only ignores the different levels, but it also numbers the paragraphs!
Just download the Raffle tickets with consecutive numbering and matching stubs from the Microsoft Office website. It is a 2003 version and I have Office 2010.   The template has sequential numbering and displays 8 tickets on 2 pages, but I need 3000 tickets.  How do I add more tickets to this document.  I have looked online for tutorials, but most are for starting a ticket from scratch.  Please help!!
Do not let me lead you into a headache under false pretences: this FAQ is not going to tell you how to fix a document that contains broken numbering. It simply explains how the numbering works: this is valuable information if you work with Word a lot, and by understanding it, you can often work out how to fix a document. However, this FAQ is not going to tell you how.  (For a discussion of methods, see: List Restart Methods).
Summary: Need to add a unique serial number to each printed copy of your document? Here's a quick way to print such numbered versions. (This tip works with Microsoft Word 97, Word 2000, Word 2002, and Word 2003. You can find a version of this tip for the ribbon interface of Word (Word 2007 and later) here: Using Sequential Document Serial Numbers.)
CK Note: Word 2007 - 2013 interface has an different automatic numbering scheme which I have been told is much less subject to corruption. Microsoft Word 2010 Bible by Herb Tyson, MVP. However numbering is still very imperfect in these later versions. I still recommend following Shauna Kelly's step-by-step instructions (see above) if setting up numbering in a template or in a document likely to be heavily edited. If you start without doing this and end up with "spaghetti numbering," fixing it will be a very large chore!