OpenBridge Modeler – Help ProStructures ProStructures CommonModeling Tools and Primitives Modeling Tools and Primitives Construction Lines ToolsWorkframesAll OpenBridge Modeler models are started with the creation of one or several Workframes. A Workframe represents the basic spatial dimensions of your project in a 3D view. Anchor Bolt StylesGrid Systems ManagerModeling Solids in OpenBridge ModelerPS Toggles