Relationship Names section allows you to specify new relationship names that will be available in the Relationships section in the Content module.
Adding a new relationship name
Select Relationship Names section.
Click the New button in the main toolbar.
Enter values:
Relationship Display Name - the name that will be displayed to the user.
Relationship Name - the name that will be used in the code. This name shouldn't be changed later.
Click OK to save.
Removing a relationship name
Click on the Delete button at the appropriate line and confirm deletion. Please note that all relationships of that type will be deleted as well!