About this task
You can add relationships between topics using a relationship table in the map. If you are using the same relationship table in a DITA map and a bookmap, you can reuse the relationship table rather than create it in both places or copy it from one to the other.
You can create relation between two or more topics of any type. However, you must group topics that you want to relate using the topic group element. A topic group under a Relation element must contain topics of same topic type.
Note:
Relationship table links do not work from topics that are the first or only topic in a chapter or appendix.