Select Stereo > Editors > Custom Multi Rig to open the Multi-Camera Rig Tool window.
Use the Multi-Camera Rig Tool to create a multi-camera rig of two or more stereoscopic cameras.
The Multi-Camera Rig Tool has a three layered multli-camera rig defined by default. You can also create your own custom multi-camera rig using this tool. You can customize the number of layers in your multi-camera rig, and you can customize the rig type for every layer. Choose between the standard stereo camera or any custom rig that you have registered.
Each rig can be associated with an object set. This object set indicates what can be seen by the rig. By default, the sets are not populated. Use Stereo > Make Links to populate. See Linking a stereo camera with a set of objects for more information.