Use web cut and flange cut symbols with profile stiffeners.
Smart 3D provides end cut symbols in the following locations:
Web cuts are in the [Reference Data Folder]\SharedContent\FTLIBRARY\Web Cuts
and [Reference Data Folder]\SharedContent\Web Cuts folders.
Flange cuts are in the [Reference Data Folder]\SharedContent\FTLIBRARY\Flange Cuts
and [Reference Data Folder]\SharedContent\Flange Cuts folders.
Assembly connection rules determine the end cut type. You can change the end cut type on the Selection tab in the Assembly Connection Properties dialog box. For more information on end cut rules, see End Cuts.