I would lean on your Workday Developer/Admin to provide the necessary API/Data Examples so you can begin to explore the options in ServiceNow (IntegrationHub or Custom API). The Workday spoke MIGHT have what you're looking for.. I haven't looked recently around cost centers.. I did an integration for manager changes from ServiceNow into Workday that worked well... it was a simple REST API endpoint that I built myself in in a flow action.
I see Workday has something that might work here:
Still, best to partner with your internal Workday team to get the proper endpoints so they can help guide you.
IntegrationHub and the HR Spoke is the same thing. I was speaking on the part of creating a custom REST/SOAP endpoint in the event the one needed didn't exist in the ServiceNow platform.
As far as REST over SOAP, I will choose REST always as it's much easier to work with, but that's more of a personal preference.
For the manager change, you will need the WID's for each person and the new supervisory org ID's as well. I built custom actions for each step in my flow to accomplish this:
I would suggest taking it a step at a time and build and test each action before trying to put it all together.
