There is a bit of information out there for you to use regarding the migration process from GP to BC Saas. We do not currently have a migration path for GP to BC On Prem. If your intent is to migrate from GP to BC Saas, I would start with the following link, so you can understand the requirements: Migrate on-premises data to the cloud - Business Central | Microsoft Learn
We also have several articles to help you through the process, specifically starting with GP data review. We have some recommendations here:
A workaround would be to migrate it to Cloud BC, and then copy the cloud BC to on-Prem.
but directly to on-Prem BC the migration is done via files (in BC files are imported via Configuration Packages).
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