The support conditions of a beam subjected to bending are essential for its resistance to lateral-torsional buckling. If, for example, a single-span beam is held laterally in the middle of the span, the deflection of the compressed flange can be prevented, and a two-wave eigenmode can be enforced. The critical lateral-torsional buckling moment is increased significantly by this additional measure. In the add-on modules for member design, different types of lateral supports on a member can be defined using the "Intermediate supports" input window.
KB 000487 | Entering Intermediate Lateral Restraints for Lateral Support of Members and Sets of Members
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Using the direct interface of RFEM 6 / RSTAB 9 with BricsCAD, you can import and export nodes and lines.
Furthermore, you can export different objects (for example, cross-sections) from RFEM 6 / RSTAB 9 to separate layers in BricksCAD.
Further features include the export of a deformed FE mesh and dimension lines.

The DSTV product interface for steel structures is available in RFEM 6 / RSTAB 9 for transferring pure member structures (including loads, load cases, load combinations, imperfections).
The DSTV interface allows you to exchange data between RFEM 6 / RSTAB 9 and the programs like "Bentley ProStructure 3D", "Tekla Structures", "Bocad", "Intergraph Frameworks", "Graitec Advance Steel", "Cadwork", and many others.

Using the SDNF interface, you can import and export data such as materials, cross-sections, members, and surfaces in RFEM 6 and RSTAB 9. It allows you to exchange the file-based data with programs such as Tekla Structures or Advance Steel.

The DXF II interface is based on a different technology than the DXF interface. It provides additional features, such as the export of deformed meshes, the export of dimension lines, and so on.
Is Revit Add-in installed automatically in RFEM 6?
How can I define RSECTION cross-sections in Grasshopper?
Which interfaces are available for the data exchange between RFEM 6 and HiCAD?