When you have 'Maintain Relationships' ON the constraints will be added as you place geometry. To see the constraints, turn ON 'Relationship Handles'. It's the button just below "Maintain Relationships'. The constraints do not print. If you place two lines with "Maintain relationships' OFF, the constraint will not be placed. Turn on 'Maintain Relationships' and use the 'Connect' command to connect the ends of the two lines. This will add the endpoint connect constraint to two unconnected lines. Regards, Rick B.