You have to do the transfer of 2024 in to the new 2025 return at the very beginning, before you enter any 2025 information. You cannot do it later. So you might need to clear and start over if you neglected to transfer the 2024 tax file.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/change-service-level/clear-start-turbota...
How to transfer last year’s return?
https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/transfer-last-y...
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