It is possible if you want to learn how and employ a custom content control change event: http://gregmaxey.com/word_tip_pages/...om_events.html

If you could use a second content control rather that a bookmark then you could also adapt the code shown here:
https://www.msofficeforums.com/word-...rols-word.html

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Greg Maxey
Please visit my web site at http://www.gregmaxey.com/