You can apply underlining, etc. at will in an unprotected Section, but not in a protected one. Although a macro could be used to unprotect a protected Section, apply underlining, etc., then re-protect the Section, you would have to be able to tell it which text to process other than by selecting it (since you can't select text in a protected Section). Do you have any rules for what text should be underlined, and when?

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]