From the Graphisoft website:
ARCHICAD Connection Add-In for Autodesk Revit
The GRAPHISOFT ARCHICAD Connection is a free Add-In for Autodesk Revit. The Add-In improves the IFC model-based and bi-directional data exchange between GRAPHISOFT® ARCHICAD® and Autodesk® Revit®.
The GRAPHISOFT ARCHICAD Connection Add-In for Autodesk Revit 2017 has three functions:
- “Improved IFC Import” imports IFC models to Revit using extra features that improve the interpretation of architectural models;
- “Link IFC” merges IFC models into the current Revit project as a non-editable reference;
- “Export to ARCHICAD” exports Revit model elements in IFC files that are specially enhanced for use in GRAPHISOFT ARCHICAD.
Important: For best results, make sure you have installed the latest version (17.2.0 or later) of Autodesk’s IFC 2017 import-export app for Revit.
For detailed information, see manual.