One way is with a protected form:
http://www.computorcompanion.com/LPMArticle.asp?ID=22

Another way is with a macro and fields:
http://gregmaxey.mvps.org/Add_Toggle_Objects.htm

--
Regards,
Jay Freedman
Microsoft Word MVP        FAQ: http://word.mvps.org
Email cannot be acknowledged; please post all follow-ups to the newsgroup so all may benefit.