The members are exported as lines from RFEM/RSTAB. The layers of these lines contain the information about the cross-sections and materials used. When exporting a DXF file from RFEM, it is possible to export the numbering, which is controlled by the navigator, in addition to the entire model - including the FE mesh.
Another option for exporting from RFEM/RSTAB is to transfer the results to a DXF file in the form of isolines. For this, you can specifically select various elements, such as isolines, FE mesh, values, and so on.