If you would like to acquire list right under the specific folder or subordinate list, you can get it using the Java API or LogicDesigner.
<For Java API>
KnObjectOperations#getChildObjects(..)
or
KnObjectOperations#searchObjects(..)
can be used with specifying conditions of ancestor by condition of KnQuery.
Also, KnSession inherits KnObjectOperations
so they can be called such as KnSession#getChildObjects(..).
<For Logic Designer>
It can be acquired by using the "Get Child Element of Drawer / Folder" task.
*The Logic Designer task is available from Winter 2017 or later.
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iAP/Accel Applications/Accel Documents/All Updates
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FAQID:1080