Answer:
The SDNF interface can be used for the data exchange between RFEM 6 and Advance Steel. This allows you to import and export data, such as materials, cross-sections, members, and surfaces.
Export to Advance Steel
You can use the File menu to export your RFEM 6 model in the SDNF (Steel Detailing Neutral File) file format:
Then, you can import this file into Advance Steel:
Import into RFEM 6
Similarly to the procedure of exporting to Advance Steel described above, it is also possible to import a structure from Advance Steel to RFEM 6 using the SDNF format.