Delphi & MySQL: Database and subdatabase

Hi,

i am new to MySQL. I used to write simple applications since delphi 5 along with BDE (Visual dBase) and few of them are still running. But now BDE is obsolete and has compatibility issues with newer versions of Windows. So, i wanted to switch to real DBMS and i decided to go with MySQL.
I wrote a simple application-driver to transfer my existing data to MySQL using ADO.
Everything ok here.

But, i have a question.
My existing database architecture uses a base directory with some tables (dbf files) which are common (lets say default values, cities, professions etc), and some other directories (lets say companies) with their individual files. what would be the best approach to this architecture? I mean is there anything like subdatabase? Or i have to create a schema for the base tables and all subdatabases will be separate schemas?

Thanks in advance.