Oracle Help projects can include an index. The Oracle Help index displays an alphabetical list of keywords, and one level of indenting is supported. Users can search for index keywords in the list. As keywords are selected, topics are listed in the lower pane. Double-clicking a topic in the lower pane displays its content in the topic window on the right.
You can import external indexes and merge them using Oracle Help remote views. RoboHELP for Oracle Help uses remote views so you can add and merge indexes. You can create separate tabs for each index or you can combine and merge them.