The actual postings are assigned to the profit centers in the local systems. At the end of each period you need to transfer any balance sheet items to Profit Center Accounting before rolling up the data to the central system. After period-end closing, all the local summary records can be transferred to the central system.
Assessment and distribution are generally performed after the data is rolled up to the central system. However, you can also do this in the local systems for the data posted there.