Assuming you are using entity “System/User” for your user-objects, then logically you will be using the associaton “System/UserRoles” to associate to System/UserRole.
As goes for every *-* association: you can drag-and-drop an associated attribute (here: UserRole/Name) from the “Connector-view” onto a dataview of the other entity (here: System/User)
hii chandan sahni,
Make a association between your entity and system’s user role entity
after it you will be able to see you can select user role name for your refrence selectore
Make sure to security setup read write for roles so you can select from dropdown else it will be uneditable in dropdown.