After creating a Data Source, I now find I need to add a new placeholder. For example, <MiddleInitial>. How do I add a new placeholder to an existing Data Source?

Assuming the data source is an Excel workbook, for example, simply add a column for the Middle Initial. As soon as you save the workbook, you can then open the mailmerge main document and insert a mergefield pointing to MiddleInitial.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]

Paul,

Thank you. I enjoy reading not only your posts to my questions to but all the others who post a thread as well.

No, the Data Source is not an Excel Workbook, it is a Word table. Or at least that is what is created when I go through the Mail Merge steps found in the Tools>Mail Merge Manager, However, I took your advice of adding column in the table and it appeared in the Data Form just like you said it would.