Hi Ameen
This depends on the selection when you copy a company code in EC01 If you select to copy company code data then system will update various tables like SKT1, SKA1, SKBI and so on...
All accounts determination that links FI with modules like SD, MM, HR and whatever the components you have in the system gets copied.
It's a big list if you really want to go through please review the thread below. That will help you.
http://scn.sap.com/thread/1564530
If it does then please complete the thread so other can use it in future.
Thanks
Naseem