Chunking is usually applied to the top-level parent topic. DITA Open Toolkit does not support applying chunking to nested child topics when the parent topic already uses chunking.
If you need to apply chunking in lower-level child topics, do not apply it in higher-level topics.
Procedure
In the DITA map, identify the parent topic under which subtopics will be nested.
Right-click the parent topic and then click XML Attributes.
Set the following attributes:
Set Linking to Target only.
Set Chunk to to-content.
Add the child topics under the parent topic.
To ensure that the child topics are not displayed in the table of contents, click XML Attributes for each child topic and set Toc to no.
