Easily see how to use bus mixes on your mixing board. Sound board tutorials. I suggest that you use bus mixes sparingly. It works well for a large amount of backup vocals or for live drums. I have found that bus mixes can cause confusion in the sound team if they are not well-trained and very aware of how the bus mixes affect the overall output. Click on the posting to watch the video tutorials.
Introduction to bus routing and sub mixing
How to set up a bus mix for drums: