This is a Drupal module that provides hierarchical entity reference field.
Entity reference field that comes with Drupal core allows creating a linear list of entity references. This module allows creating hierarchical entity references where each entity reference can be in a parent/child relationship with another entity reference. It also supports revisions if used together with Entity reference revisions module.
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Entity reference items can be dragged and dropped with the same UI that handles taxonomy menu links hierarchy.
Download and enable as any other Drupal module.
- Add a field of type Entity reference hierarchy or Entity reference revisions hierarchy to your entity.
- That's it. Start entering content.