Import a company from other database

Versions: NAV 2016

We have two databases of same version 2016. One is main one which is bespoked. Other one is standard obviously data in it and has few companies. I would like to have those companies from standard one get imported to the main one as additional companies. So lets say main database has companies 1,2 and 3. The standard one has company A. The end result should be 1,2,3 and A in the main database.

How would you achieve that?

Thanks.