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Here are steps to upgrade to Business central .This is old way that is merging the objects into standard objects . Anyway not recommended to do this and it is better to create extension and publish it

Listed here some of the steps to upgrade business central from NAV 2018

1. Merge all customization of old database to business central on-premises. Merging can be done using PowerShell(recommended) or manually (not recommend)
2. Rectify all the errors and keep the object ready for upgrade.
3. Take full SQL backup of old database.
4. Install the Business Central from DVD.
5. Uninstall allthe existing extensions from old database.
6. Upload business central partner license into the old database.
7. Delete all object except tables from old database.
8. Clear all server instance and debugger breakpoints records from the old database.
9. Make sure user with whom upgrade is carried out should have privileges of DB_Owner in Sql.
10. Open business central development environment as an Administrator.
11. Open the old database in Business central, which will ask for convert.
12. Skip the schema synchronization at this point of upgrade.
13. Import the upgraded objects on converted database in business central with selection of Replace All.
14. Skip the schema synchronization at this point of upgrade.
15. Import appropriate upgrade code unit from product DVD.
16. Connect new database to appropriate NAV service.
17. Increase SQL command time out to maximum number.
18. Compile all objects with schema synchronization.
19. Execute data upgrade process and import permission set.
20. Make pages searchable by using ‘Build object search Index’ option from developer environment.
21. Remove all unwanted objects
22. Get Ready to face customer queries from new database