Define a cross section using polygon in Tekla

User-defined cross sections can be used for creating fixed profiles. Define the needed cross sections before creating the profile. Use any of the following methods to define a cross section: 1. Define a cross section using polygon. Use this method to create a cross section with fixed dimensions. 2. Define a cross section using a plate Use this method if you have a contour plate in the model. 3. Define a cross section using a DWG file. Use this method if you have a .dwg file of the profile you want to define.