Support parent-child relationships

In some circumstances, an entity is only relevant as part of a parent-child relationship. For example, a venue, such as a stadium, might have multiple layouts. The layouts are entities in their own right, but should only be modified through the owning venue.

Note:

• The entity should not appear in the main menu on the left
• The view/create/edit for the child should be a separate screen
• Once a child has been viewed/created/edited, you should be returned to the parent entity create/edit screen
• A bi-directional one-to-many/many-to-one relationship could be used as an indicator of wanting this behavior