Note: If you are a developer, you would do much better to use a Document Variable rather than a Document Property (so that the user can't update the version without using your macros); and to write a version control macro assigned to an “Update Version” button to take care of updating the document variable, the “Last  Updated Date”, the revision history and the document's filename (and the filepath, if you have an archive strategy for old versions), as well as taking care of transitions between draft and live status. However, that is outside the scope of this article.
To save the list style to a template so you can use it with other documents, select the list in the document. Access the Multilevel List dropdown and choose Define New List Style. Enter a descriptive new and select the New documents based on this template (at the bottom). Once you click OK, the multilevel list style will be available in all new documents.
Warning  Making even minor changes to an outline numbering scheme won't necessarily change the initial position you've selected in the gallery, but rather may create a new gallery position, overwriting an existing one. Because of this problem, attaching numbering to styles is strongly recommended. This is covered in greater detail later in this chapter and in the chapter on Styles.

I cannot (despite 3 weeks of trying) set up outline numbering on MS Word (Tried 2003 & 2007 with same problem). I link all the headings to styles and understand the need to set the customise number box so that only the one number box style applies to the whole document. But when I try to set up the 9 levels, the number format appears fine at first, appearing as 1; 1.1; 1.1.1; etc as desired but when I try to display the previous level number (level 1 number with level 2 heading) to appear as:
The SEQ or Sequential Numbering Function in Word is the best and quickest way to number your tickets. Many raffle ticket templates use them, yet few sites explain how it works. To see if it uses the SEQ function, you need to download the template first. Then, open it in Word, click right in the middle of where a serial number is, and then right-click.
The heading here could be anything: affirmative defenses in an answer, articles in a contract, etc. It doesn’t matter; the technique is the same with only slight variations. The result is that you’ll have a heading saved in your Quick Parts that will be numbered correctly, no matter how many items you add or delete. This makes this technique particularly useful in building templates for common documents; because it’s always easier to delete than add, they’ll re-number themselves after editing.
You can change all three settings, but they aren't on the Numbering option's dropdown, where you might expect them. To access these options, right-click the numbers (not the list) and choose Adjust List Indents from the resulting submenu, as shown in Figure C. In the resulting dialog, adjust the appropriate settings. For example, in Figure D, you can see that I've transposed the first two settings. Figure E shows the new settings in place. If the ruler is enabled, you can also see that the left tab the feature uses moved accordingly. desktop numbering using indesign