After changing person number for Employee After Global Transfer no history for old Person number

Hello

I have a requirement to get history of person number for an employee after Globally transfer and changing his person number

for example Employee Person Number was Q1234 and after globally transfer this employee I changed his person number to be E1234 , I need to be able to get history for his old person number ,

how can I achieve that

Also if Employee have 2 assignment and I changed his person number , both assignment will changed to the new person number , how can I get history for his old person number