After you changed that, some numbers may have re-set
...THUS You might need to go thru the NC Part-Year tax return again.....From Start-to-Finish so that you can "Allocate" what parts of your Federal income is also NC income...just the $$ amounts that were received for working in, or while living in NC.
(If you happen to have a rental property in NC, then all the net income from that property is still NC-taxable for the whole year)
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*