Did you try it? The same tutorial is even available on this site: https://www.msofficeforums.com/mail-...-tutorial.html
For some worked examples, see the attachments to the posts at:
https://www.msofficeforums.com/mail-...html#post23345
https://www.msofficeforums.com/mail-...html#post30327

Another possibility, depending on your data & needs, is to use a DATABASE field in a normal ‘letter’ mailmerge main document and a macro to drive the process. An outline of this approach can be found at: http://answers.microsoft.com/en-us/o...1-1996c14dca5d
Conversely, if you're using a relational database or, Excel workbook with a separate table with just a single instance of each of the grouping criteria, a DATABASE field in a normal ‘letter’ mailmerge main document could be used without the need for a macro. An outline of this approach can be found at:
https://answers.microsoft.com/en-us/...f-8642e46fa103
For a working example, see:
https://www.msofficeforums.com/mail-...-multiple.html

The DATABASE field can even be used without recourse to a mailmerge. An example of such usage can be found at: https://www.msofficeforums.com/mail-...html#post67097

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]