By default, formfields have an internal bookmark name when inserted (e.g. 'Text1'), though you can change or delete the bookmark. To reference the field, therefore, all you need do is to insert a cross-reference to the bookmark. As for having the cross-reference automatically update, all that requires is for you to check the formfield's 'calculate on exit' property.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]