On the top of the dialog there are two options in order to select profile type (Stiffener type) and name (Stiffener name).

There are 6 types of vertical stiffeners arrangements present for selection in Stiffener type selection list: Left, Right, Left and Right, Symmetric outward, Symmetric inward, Symmetric inward/left and right. 

• Left: Vertical stiffeners positioned on the left side of each girder.
• Right: Vertical stiffeners positioned on the right side of each girder.
• Left and Right: Vertical stiffeners positioned on the both sides of each girder.
• Symmetric outward: Vertical stiffeners positioned toward the exterior starting from a central point of the main girders.
• Symmetric inward: Vertical stiffeners positioned toward the interior of the main girders.
• Symmetric inward/left and right Vertical stiffeners positioned in such a way that the exterior girders have stiffeners positioned toward interior and the rest on both sides.

After selecting the right Profile Id and a name In Stiffener name field is entered, just click Add and a new Stiffener profile is present in the list on the right side of the dialog. Using modify option changes can be applied to an existing profile in the list, but the name cannot be changed anymore.