Select File>Export>CATIA v5. You are now presented with a selection menu that allows you to select points, lines, arcs, conics, polylines, splines, NURB splines, sheet bodies, solids and part references to export.
Select the entities you wish to export. The Export CATIA v5 Part File dialog box appears. Through this dialog you are able to set export options and export the selected entities to a CATIA v5 file.