Create a catalog (or in XP and later it's called directory) type mailmerge
main document that uses the same datasource and in which you have a one row
table with the mergefields in the cells of that table. When you execute the
merge to a new document, it will contain a row of data for each record in
the data source. If you then insert a row at the top of the table and enter
the names of the mergefields into that row, you can use that document as a
datasource if that is the easiest place to make any revisions.
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Hope this helps.
Please reply to the newsgroup unless you wish to avail yourself of my
services on a paid consulting basis.
Doug Robbins - Word MVP