2 levels structure. You can change the sequence keeping sounds, change the sounds keeping the sequence, both.

Parts. You can consider parts as a kit (with sounds and fx settings to sum up). If you change the part, you can change these parameters, keeping your pattern sequence.
It can also be useful to reload a saved part after tweaking many parameters.

Patterns. These parameters can also be plocked holding trigs, including samples. A plock with a different sample is called a sample lock.

In a song, I’d rather use sample locks, if other parameters don’t change. For drastics changes (machines, fx type) you need a part change.

If you change song, it’s better to change part.
Only 4 parts in bank (I’d want 16), so some people organize their parts like this :
Patter 1-4 > Part 1
Pattern 5-8 > Part 2
Etc

You can edit any sample slot with Func + Bank, double tap a Flex or a Static track to access sample slots.

Read the manual, practice. Merlin’s guide is oftenly recommended especially to understand parts.

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