Use the Select Relationship dialog box to search the relationship hierarchy and select a relationship to return to the Relation field.
Click the Detail menu of the Relation field to display the Select Relationship dialog box.
On the Select
Relationship dialog box, click next to the relationship
hierarchy you want to expand.
Click next to the relationship you want to select. This returns
the value to the Relation field.
Click Cancel to dismiss the Select Relationship dialog box without selecting a relationship.