How to set relationships between Domains:
If you add a Domain manually to GenRocket it only take a few steps to assign a parent Domain to it. Each Domain can only have 1 parent Domain.
Navigate to the Domain Dashboard of the Domain that will be the child.
Click on the "Relationship" tab
In the Referential Parent Domain, click "Add Referential Parent".
In the dialog, select the parent Domain.
The parent has now been added to your Domain.
This screen recording shows how to add a referential parent to a Domain