Since you haven't even given us a link to the video, let alone said exactly what you've done, how are we to know?
For the mailmerge basics, see:
https://support.office.com/en-us/ar...eadsheet-858C7D7F-5CC0-4BA1-9A7B-0A948FA3D7D3
Your reference to 'Mail Merge Multiple Rows into One Document' suggests you're after something considerably more involved that a simple mailmerge, though. You can use Word's Catalogue/Directory Mailmerge facility for such a merge (the terminology depends on the Word version). To see how to do so with any mailmerge data source supported by Word, check out my
Microsoft Word Catalogue/Directory Mailmerge Tutorial at:
http://www.msofficeforums.com/mail-...d-catalogue-directory-mailmerge-tutorial.html
or:
http://www.gmayor.com/Zips/Catalogue Mailmerge.zip
The tutorial covers everything from list creation to the insertion & calculation of values in multi-record tables in letters. Do read the tutorial before trying to use the mailmerge document included with it.
Depending on what you're trying to achieve, the field coding for this can be complex. However, since the tutorial document includes working field codes for all of its examples, most of the hard work has already been done for you - you should be able to do little more than copy/paste the relevant field codes into your own mailmerge main document, substitute/insert your own field names and adjust the formatting to get the results you desire. For some worked examples, see the attachments to the posts at:
http://www.msofficeforums.com/mail-...ate-names-but-different-dollar.html#post23345
http://www.msofficeforums.com/mail-...creating-list-multiple-records.html#post30327
Another option would be 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/...g-tables/8bce1798-fbe8-41f9-a121-1996c14dca5d
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...gle-page/4edb4654-27e0-47d2-bd5f-8642e46fa103
For a working example, see:
http://www.msofficeforums.com/mail-merge/37844-mail-merge-using-one-excel-file-multiple.html
The DATABASE field can even be used without recourse to a mailmerge. An example of such usage can be found at:
http://www.msofficeforums.com/mail-merge/21847-mail-merge-into-different-coloumns.html#post67097
Alternatively, you may want to try one of the Many-to-One Mail Merge add-ins, from:
Graham Mayor at
http://www.gmayor.com/ManyToOne.htm; or
Doug Robbins at
https://onedrive.live.com/?cid=5AEDCB43615E886B&id=5AEDCB43615E886B!566