In some areas around the world, the precast beam flange is extended out to follow the deck edge, thus avoiding overhanging form work required during pouring of the deck. In OpenBridge Modeler, you can chose to enable these options individually for each of the left and right exterior beams, by checking the option to Follow Left Deck Edge or Follow Right Deck Edge respectively. 

When activated the top key point of the deck is automatically set to follow the bottom key point on the deck slab for the respective sides of the beam.

Please note that in the beam template definition, the flange bottom point must be constrained with respective to the flange top point.