After you start a keyword search, a list of suggested keywords for the topic is displayed. You can add new subkeywords from this list.
Note: If you are creating an index automatically, this feature does not apply.
Select the main keyword that will use the new subkeyword.
Click Options and select New Sub-keyword from the menu.
Type a name for the subkeyword, and then press ENTER. The new subkeyword is added to the list, underneath its corresponding keyword.