I would set them up as 5 controllers with 16 channels each.
If you have them that way already, you can right click on each controller, and change the "universe" to be 1. You'll then have to change each track/channel of controllers 2-5 to be the right number. For controller #2, change track #1 to be channel 17. You can do that by right clicking on each track and changing the channel number.
If you haven't done much sequencing, it may be easier to start a new sequence and add the controllers, changing the starting channel # for each controller.
I try to setup a "base" configuration sequence, with all the controllers defined, and import it in as the base for all my actual songs/sequences.