Company code for Customer Vendors in SL

Hi,

Please could you let me know how can I get customer list for each company in database. As per my observation in demo system database60 contains all the customers which belong to company code 60,70,80  and database20 contain all the customer,vendor  for company code 10,20. Please let me know if there's a way to differentiate customer in same database i.e list of customer for company code 60 ,70,80 separately.

Thanks,

Archana