Using previously un-used heading levels would be more suitable for situations where you want to maintain two separate numbered lists that both make use of the "magic" properties of the built-in headings; for example, this would be the case when you set up appendix numbering as discussed in the article at

I would like to number a voucher book, i have place 4 vouchers on a page, the thing is that i want each of these vouchers to start with different number, 100, 200, 300, 400, and then i want to number them 99 times. The problem is that they have to be numbered only 1 per page, so that when i have printed them all i can easily crop them and staple them right up with having to go through it all.
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.
To modify the options, click the Multilevel List option (in the Paragraph Group). Word selects all lists currently in use in the List Library. You'll see two options below the gallery: Define New Multilevel List and Define New List Style. Use the first to create and save a stable custom list style. You'll use the second to change list styles. You can also use the latter to create a new style. So, what's the difference? The Define New List Style option lets you name a style, so you can share, modify, and delete it later. Most users will never need this option. Now, let's move on: choose Define New Multilevel List. Figure D shows the resulting dialog.
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.
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In the example I explained, I was using a list, but did it with un-linked text boxes using “continue from previous number” and “continue numbers across stories.” I’m guessing that there is no way to tell InDesign that even though there are 4 text boxes on the page, that there are two different lists? I’d probably have to just create two threaded stories for that scenario to work.
You can use Microsoft Word to create complex documents. Books and other large documents occasionally require different page number formats in different sections of one document. For example, you can number the index pages with Roman numerals (for example, "i.", "ii.", "iii.") and the main document with Arabic numerals (for example, "1", "2", "3"). This article describes how to set up different page numbering formats.
It's also possible to consecutively number list items in InDesign. Create a text frame for your list and click the numbered list button to insert a list. Type your list items, pressing your "Enter" key between items. InDesign consecutively numbers the list automatically; you can change the number it begins with and the style of the numerals. Press your "Alt" key (Windows) or "Option" key (Mac OS) while clicking on the numbered list button to open a dialog where you can modify those options.
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Michelle Castle began writing professionally in 2005. She has written technology news and tutorials for consumers, brochure and web copy for the Ehlers-Danlos National Foundation, and promotional materials for religious nonprofits including the International Pentecostal Holiness Church. Michelle has a Bachelor of Arts in English from Oklahoma State University.

There may be instances in your Adobe InDesign documents that you want to change the start page, by default the numbering starts at page one on the first page of your document but if you right click on for example page 2 you can select ‘Numbering and section options’ then you can click the button ‘Start page numbering at’ then type ‘2’ in to the box. this will snow start a new section on page two which will make page 2’s page number actually page 1. You can start new page numbering sections anywhere in your Adobe InDesign document. 
Numbering in Word is a bit of a nightmare at times and if you need multi-level numbering this could cause you much stress if you rely on the mouse alone. Using the keyboard to some degree makes this task very simple. I will explain how to create a multi-levelled numbered list and ask you to keep all the default formatting that Word gives you. This can be changed and modified but sometimes it messes up your layout. I advise to use what is there until you have the times and patience to master its intricacies.
Thank you for your reply.  It reassured me that I was on the right path. From having read other Help texts, I guessed that I would have to use good ole mail-merge and set up a numbers list in Excel. Luckily my knowledge of Excel was good enough to know about the drag&drop for sequential immediate numbering. When it came to the crunch, it was this particular type of mail merge which gave me a bit of initial difficulty. Despite my having used it happily and often in Word, for labels in Publisher, it was - not surprisingly - different in certain respects; principally the crucial point of the Print stage, which necessitated finding the option Publications & Paper Settings, and selecting 2 specific parameters, namely (1) Multiple pages per sheet,  (2) Single-sided printing (my default double printing had appeared). Once I'd sussed this, it was plain sailing.  Thanks again.