What happens when I delete a resource from a non-project specific planning resource breakdown structure?

The resource is immediately deleted from the non-project specific planning resource breakdown structure (PRBS) if the PRBS isn’t assigned to any projects.

If the PRBS is assigned to at least one project then deletion of a resource from the UI marks the resource as disabled in the UI. When you run the Update Project Performance Data (UPPD) process then, the process first rolls up the actuals or planned amounts for the resource and then deletes the resource from the PRBS.