Select File - Export Current Model - Surfaces - CADDS4X to display the Save CADDS4X Surfaces dialog box, which you use to save the surfaces as an CADDS4X surfaces file (*.c4x).
This is the standard Windows™ Save As dialog box. For further information about how to use it, click on the
button on its Title bar, and click on the area you are interested in.
File - Export Current Model - Surfaces