Users can merge DITA topics by using the following attributes:
chunk="to-content" outputclass="ft-merge"
Example:
<topicref href="chocolates.dita" chunk="to-content" outputclass="ft-merge">
<topicref href="milk_chocolate.dita"/>
<topicref href="chocolate_powder.dita"/>
</topicref>
Fluid Topics merges the three topics into the parent topic: chocolates.dita. End-users cannot bookmark milk_chocolate.dita and chocolate_powder.dita, or add them to a Personal book.