Unfortunately, data cannot be transferred from one account to another. Your son will need to start his new account from scratch. But, if he has a CRA My-Account he will be able to auto-fill his information and slips from the CRA.
For more information on Auto-Fill, please see our TurboTax article:
The Complete Guide to Auto-Fill my Return (AFR) | 2022 TurboTax® Canada Tips (intuit.ca)
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