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Unfortunately, at this point in time, Google doesn’t provide a straightforward solution to import historic data from Universal Analytics to GA4. The “Import from Universal Analytics” button is actually for bringing in goal configuration and not historical data. Currently, even if you’ve linked GA4 with Universal Analytics, old data from Universal Analytics won’t get migrated to GA4 – they exist separately.
Google has pointed out that GA4 is designed with different architecture and data models in mind, hence, a direct import is not feasible. However, GA4 does offer Data Import feature where you can upload CSV files for data like products, refunds, user data and campaign data but not historical user behavior data.
Also, please be aware that despite setting up a new GA4 property, your Universal Analytics properties will continue to collect data independently, so you’re not losing any data during the transition, and you can still reference old data.
