Sub-folders (child folders) can be created within a Folder.
Note
- Group administrators, Sub-administrators, and Folder administrators and Sub-administrators can create Sub-folders.
- The hierarchy can have up to 5 levels.
Related:
Create, delete or edit sub-folder (Web Browser)
https://teachme.jp/8/manuals/4929349
How many Folders and Sub-folders can be added?
https://help.teachme.jp/hc/en-us/articles/900005509726
Can different viewing permissions (access permissions) be set for Folders and Sub-folders?
https://help.teachme.jp/hc/en-us/articles/900005510486