When you change a parameter (*)on a track in one pattern, all other pattern, that use the same part will also have that parameter changed on this track.
*All parameters on machines and effects, all midi parameters including midi channel, program change, cc assignments.
Parts can be compared to kits on other Elektrons, but OT only has 4 parts per bank of 16 patterns, on other Elektrons you can assign a kit to every single pattern, if you’d want that.
Maybe we could help you better if you gave more details what exactly you want to do?