To upgrade from Dynamics NAV to Business Central, follow these steps:

1. Assessment: Evaluate your current Dynamics NAV setup, including customizations and integrations, to understand the impact of the upgrade.

2. Backup: Make a complete backup of your Dynamics NAV database and files to ensure you can revert to the previous state if needed.

3. Upgrade Preparation: Ensure your Dynamics NAV version meets the prerequisites for upgrading to Business Central. This may involve updating to a supported version of Dynamics NAV first.

4. Data Migration: Use the Data Migration Wizard in Business Central to transfer your data from Dynamics NAV to Business Central. Ensure data integrity and consistency during this process.

5. Functional Testing: Test the upgraded Business Central system to ensure that all functionalities work as expected and that data is correctly migrated.

6. User Training: Provide training to users on the new features and functionalities of Business Central to ensure a smooth transition.

7. Go-Live: Once testing and training are completed, schedule a go-live date for the upgrade. Monitor the system closely after the upgrade to address any issues that may arise.

8. Post-Upgrade Support: Offer post-upgrade support to users to help them adapt to the new system and address any issues that may arise.

Following these steps will help you successfully upgrade from Dynamics NAV to Business Central.