System Configuration : I/O Setup : I/O Setup Pages : Bus Page

Bus Page
The Bus page of the I/O Setup lets you create and edit internal mix busses and output busses. The Bus page also lets you map output busses to output paths (as configured in the Output page of the I/O Setup).
Configure bus path names and formats, and map any main bus path to any available output of the same width or greater. Multichannel bus paths (stereo or greater) can have any number of sub-paths. Output bus and internal mix bus names and channel widths are saved with and recalled from the session.