Quite a few users use parts like this:
Patt 1-4 -part1
Patt 5-8 -part2
Patt 9-12 -part3
Patt 13-16 -part4
But you can freely assign them any way you like within the same bank.
Quick way to learn is load the demo project, play a pattern, switch to a different part see what happens when the pattern is playing a different part.
Also read Merlins guide, a lot of users find that helpful.
https://eu5.dh-cdn.net/uploads/db8181/original/3X/b/4/b4e73b0afd5bbeb5f7daf2b176c73e1f7092f6b0.pdf
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