You can't using the "out-of-the-box" facility.
One way to do it is to use VBA and Word's Mail Merge events to change the
value of the subject line for each e-mail. Another possibility would be to
use Doug Robbins' approach at
http://word.mvps.org/FAQs/MailMerge/MergeWithAttachments.htm
Peter Jamieson
>I am creating an email merge and would like to insert the individual
>account
[quoted text clipped - 3 lines]
>
> Thanks!!