@davidmatyas 

IIF only offers limited functionality for your case. You can use a migration tool as another option. It's $299 one time license and you can get $100 cashback to purchase it via a partner.

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But if you prefer not to lose any of your data in QB Desktop 2023 files, you should contact @Fiat Lux - ASIA for advise. You can access your archive files for good in QBD 2023 and you may start from scratch in QBD 2021.