Any term in a term list may be modified or deleted without affecting any of the references in the library or any links between term lists and fields.
To edit a term in a term list:
From the Tools menu, select Open Term Lists and select the list that contains the term to be modified.
Select a term, and then click Edit Term. If multiple terms are selected, only the first one opens.
Change the term as necessary and click OK when finished. The modified term replaces the original term in the term list. (If the term already exists, the OK button is dim.)
Note: Editing a term in a term list does not change all occurrences of that term in your library. Use the Find and Replace command from the Edit menu to find the old term in your references and replace it with the new one.