List Child Items of a Hierarchical Post Type
Adds a [child_items] shortcode that lists the children of the current page or hierarchical item, such as sub-services under a service.
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Only Top-Level Items on Hierarchical Post Type Archives
Lists only parent items on the archive of hierarchical post types, such as services with sub-services, so child items do not crowd the overview.
Parent Page Column for Pages
Adds a Parent column to the Pages list with a link to each page's parent, so the structure of a large site is clear even when the list is sorted or searched.