To set an index keyword to be inactive
Open an index file, click the keyword you want to turn into an inactive link, and then click Edit Selection.
Edits the associated name, file, URL, keyword or style information for the selection. Click the Advanced tab, and then select the Target is another keyword check box.
Click the General tab, and then click Edit.
In the File or URL box, replace the file name or URL with the keyword exactly as it appears in the Keyword box, and then click OK.
Note
This sets an index entry to jump to itself, creating the appearance of an inactive link.