This feature will help you to simplify the object structure in a way that it keeps the possibility to adjust the materials or environment because it combines polygones which has the same materials. When you open a c4d scene file which was saved with ArchiCAD 18+ there will be a pop-up message asking if you want to combine the project.
Disable the material flag if you don’t want to override your previously made change with the ArchiCAD material, click on OK. In Cinema 4D, go to File menu > Merge and browse for the second version of your model. Export a second version from ArchiCAD (which includes your changes in the geometry for example). Adjust a material or assign a new one to an element. Open your previously exported c4d in Cinema 4D. Therefore, you won’t loose your adjusted materials if you use update merge with the following settings shown on the below screenshot. There is a possibility to update your exported scene with a second version if you have to modify the geometry but you’ve already made some changes in material settings in Cinema 4D on the first version. With this method, you will save your ArchiCAD model (all elements which are visible in your AC 3D window) with its materials and also you render settings and environment will be included. 
(You can enable ‘Start Cinema 4D after save’ checkbox if you don’t have Cinema already open)
Specify the path for the c4d file then click on Save. Click on the arrow next to the photograph icon and select ‘Export to CINEMA 4D’. Go to Window menu > Palettes > Photorendering Settings and open the palette where all CineRender render settings can be found. export with Cinema 4D Exchange Add-on (plugin). built-in export from Photorendering Settings window. There are two ways for exporting a c4d file from ArchiCAD: 
Built-in CineRender is good for rendering quick visualization of your project but if you want to have more advanced possibilities to compose a multi-pass image or render a video with Teamrender then you might want to use Cinema 4D for that.
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