When you want to create a database export from the production environment it is now restricted to a few companies in the export.

So it is impossible to create a database export with multiple companies.

It is also impossible to restore to the sandbox and then delete companies. After deleting companies, you can not export the database from a sandbox environment. There is no option for that. It is prohibited.

Because you have only one production environment, exporting your database outside the environment is impossible.

Please make it possible to export the database with a greater number of companies.