Use a catalog (or in Word XP and later, it's called a directory) type
mailmerge main document in which you have a single row table in the cells of
which you insert the desired mergefields from the datasource. Then when you
execute that merge, the document produced will contain a row of data for
each record in the datasource. After executing the merge to a new document,
insert a row at the top of the table in that document into which you insert
the field names if desired.
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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