NG Dialogue has a specific hierarchy and administration in regards to landing page templates management.
Admin can create his folders and templates respectively.
Admin is not authorized to create any templates inside of Partners' folders that are marked with italics.
It works vice versa: Partner is not allowed to create anything in Admin’s directory. Although Admin can delete or rename Partners' folders. Partners can rename or delete only their folders.
Although Partner cannot manage Admin’s templates, he can copy them and use them to create a similar landing page.

Also, Admin can make templates visible only for certain customers by managing Templates Visibility:

If you create a template under Admin, then copy it under Partner, you can edit it, use to create a landing page under any Customer, and then delete the parental template under Admin.

If you use a template to create a landing page, it won’t be possible to delete it