The problem with what you are trying to do is that cross-references are fields and, if you change the 'Definitions' part of the cross-reference, those changes will be lost immediately anything causes the cross-reference field to update (e.g. a print preview or printing the document). Furthermore, you can't use Find/Replace to add/delete content to the field's result.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]