Welcome to the PlayStation Community.
Is there anyway to migrate your stats from your old gamertag to your new gamertag?
IE GamerTagA ------migrate stats-----> GamerTagB
If you're referring to your PSN ID then no, sorry this is not possible, stat's, trophies etc are tied to the PSN ID & cannot be transferred from one to another.
Customer Service - 1-800-345-SONY (7669)
Account & billing Support -1-877-971-SONY (7669)
Available Mon to Fri 8am - 8pm PST
Live Chat Available Mon-Sat 6am-10pm PST & Sun 6am-8pm PST