To set a field as a key, click the

Key

column of the field that you want to set, and then specify the field as either a primary or foreign key. When you set a foreign key, you also select the name of the source that contains the related primary key.

To remove a primary or foreign key designation, click the

Key

column of the field and select

Not a key

.

To clear all the keys, click the action menu at the top of the

Hierarchy Fields

panel, and then select

Clear Keys

.