I have a document with a specific text which will need to display 2 versions, a longer version the first time it appears on each page, and a shorter version every time it appears thereafter on the same page.

e.g. suppose a company name 'Widgets R Us (a widgetco subsidiary)' and it's shorter version 'Widgets R Us'

I have this working using a macro in another document, but this current document will have an area where the user will edit text in a certain area within the document, and I can't use the macro to cleanup afterwards.

Is there a way to do this (either using field codes or some other device) which will automatically update when the text reflows as the user is editing the text?

I don't believe what you're after is feasible. Why can't your macro clean up the text afterwards?

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]

Sorry for the late reply, I've been swamped with work, and the holidays were hectic.

Thanks for the verification; I didn't think there was a way to do this, but if there was, you'd be much more likely to know than I would.

Once the client runs the program from the template we provide them, the resulting documents will be ultimately distributed as a macro-free file to other people to use with the editable areas enabled, so we have no control over the final users.