Using the Steel Connections: Principal Beam-to-Beam (Pinned) extension, you can define the following types of a pinned steel connection between a principal beam and a beam:
At the top of the dialog are 2 selection lists:
You can select a connection name and / or number from these lists or specify a new number or name:
At the bottom are 3 buttons:
Details concerning the calculation algorithms for steel connections can be found in the main Autodesk® Robot™ Structural Analysis help file (see Steel Connection Design).