Convert on-hands with predefined serial control using legacy Serial Numbers (SN)

This is for a new go live. The items are defined with serial generation as predefined. We need to convert the on-hands with legacy serial numbers and the prefix is as follows: XX2412- 0000100 Were XX = PLANT, 24 = year manufactured, 12 = week manufactured and then the number. So we just cannot predefine SNs. Is there a profile that we can leverage when using the FBDI that will allow dynamic SN generation. Or do we need to define the items serial control as dynamic entry at receipt, load the on-hands with SNs and then change the SN