You can create a multi-camera rig of two or more stereoscopic cameras using the Multi-Camera Rig Tool.
The Multi-Camera Rig Tool has a three layered mutli-camera rig defined by default. You can also create your own custom multi-camera rig using this tool.
Create a custom multi-camera rig
For more information about custom rigs, see Create a custom rig.
Your custom multi-camera rig is created. Furthermore, your custom multi-camera rig is populated in the Create > Cameras menu and the Stereo > Create menu so that you can create additional instances of this multi-camera rig.
Create a default or existing multi-camera rig