Use the interfaces for more efficient work. You can import your structures in the DXF format as lines from Autodesk AutoCAD into RFEM 6 / RSTAB 9.
Furthermore, you can export different objects (for example, cross-sections) from RFEM 6 / RSTAB 9 to separate layers in Autodesk AutoCAD.
Further features include the export of a deformed FE mesh and dimension lines.
AutoCAD Interface in RFEM 5/RSTAB 8