My quick process involves setting up a row of plaques with a01, a02, a03, thru a09. Then copy the plaques to the clipboard. Run the REPLACE TEXT feature to replace "a" with "1". Move row down and paste clipboard back into page. Run REPLACE TEXT to replace "a" with "2". Repeat until I get all the numbers. It's faster than manually typing the numbers in but I know there's go to be someway of automating the process.
See Word's Numbering Explained by John McGhie, MVP - comprehensive and not pretty (Downloadable pdf file in letter size) - Reading this is vital to anyone attempting to use automatic numbering or bullets in a law office setting or other places where the documents are likely to be reused or heavily edited. See also How to Create a Template with a downloadable template with style-based numbering.
Now for the slightly hard bit. If you just try and complete your merge now, you'll get several pages of tickets. Each page will have four tickets on it. But all tickets on any page will have the same number. Each page will have a different number, but all the tickets on that page will have the same number. That's no good. You need each ticket to have a different number.
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If the second number on your raffle ticket is one higher than the first number, you must have accidentally put the <> tag after the first number (causing the next number, on the same ticket, to increase by one). You only need the <> after the second number on each ticket, so the next ticket gets a new number. (But you don't need it on the final ticket on the **page**, because the next **page** automatically gets a new number) sequential numbering using publisher