One or more Cascading Data Sets can be configured for a Document Type. To assign a Cascading Data Set to a Document Type, the Document Type must have the Cascading Data Set's root Keyword Type assigned to it. Child Keyword Types that are not already assigned to the Document Type can be added to the Document Type when configuring Cascading Data Sets for a Document Type.
Tip:
Order the Keyword Types in the Keyword Type Assignment dialog box's Selected list to reflect the parent/child relationship of any Keyword Types that are part of a Cascading Data Set.
From the Keyword Type Assignment dialog box: