The lifetime of a subdocment is associated with that of its parent. Subdocuments help to organize content within a document by externalizing it. This makes it easier for teams to work on a document together. Referencing parts of the document is also easier.
Description
To improve the collaboration within a team, a larger document may be subdivided into subdocuments of type Section. The sections, as individual documents with a unique URL, makes it easier to be referenced from other documents.
The screencast shows how authors can organize their content in subdocuments easily.
Screencast
Watch this screencast on YouTube: