Tcode: FB01 - Restricting company codes in the drop down list

Hello,

We have ERP 6.0 and using FI, SD, and MM modules. When we have copied a new client 900 from 000, all company codes also were copied. In the new client 900, in the tcode FB01 there is a field 'company code', on this field when we do F4, it displays all company codes available which were copied from client 000. We don't want to display all these company codes except our company codes. Can anybody please advice is there anyway to restrict the drop down company codes list?

I appreciate your help

Best Regards,

Krish