Can I transfer my sons return to a new account in his name? It is currently in my intuit account

[TurboTaxSusan]

Unfortunately, returns can't be transferred from one account to another. However, you can still give him PDFs of his past returns for his reference. If he has a CRA MyAccount login, then he can use Auto-Fill, which will not only enter his slips for him, but also some carry-forwards, like tuition.