ArchiCAD Exchange for Cinema 4D offers a dynamic connection between the two applications. It converts any 3D ArchiCAD file to a new Cinema 4D file, or it updates any existing Cinema 4D file.
Furthermore, native Cinema 4D files can be opened or saved.
A detailed description of how ArchiCAD works in conjunction with Cinema 4D can be found in the ArchiCAD documentation after the plugins have been installed:
Details regarding working with materials (replacing, exchanging, etc.) in Cinema 4D can be found here.