Let me preface this by saying I'm about 95% sure I WON'T be making any kind of informal or formal complaint, and I'm also not here to moan uselessly.
For information's sake, what rights does a PTer have in regards to being reassigned to different parts of the hub? We're typically left in the dark as to why such moves occur, and it does impact people in terms of hours. Thanks!
You're not really providing any specifics. But get used to this answer:
It depends.
It's going to depend on the language in your local supplement, but the general rule of thumb is that "preferred jobs" (small sort, irregs, clerking, picking off, sorting, etc.) are assigned on the basis of seniority when an opening is available from the "preferred jobs list." You would need to sign this list to express an interest in this job and file on it if the company doesn't honor the list and skips you.
As far as getting put on a different belt (if you're a loader) or a different quad (if you unload) again: it depends. In my area, the company is supposed to send PT'ers to "help out" other areas according to qualification AND seniority. For example, if management needs a sorter on the sort aisle then the junior-most qualified sorter in my area is supposed to be taken first. If they need someone for an "unskilled" job, then the most junior employee is supposed to go if these moves are temporary. If someone is being permanently moved, it would be entirely on seniority (junior most employee again.)
If you're being violated, you're going to have to talk to a steward and possibly make an "informal or formal complaint" unless you're happy eating
sandwiches for lunch every day.