Hi
Client level: The same seetings are availble to all the company codes under the same clinet.
Company code Level: This means those are applicable to perticular company code.
Chart of Accounts level: This means setting we made can use all the company codes using the same chart of accounts. and please find the below link for your needful.....
https://scn.sap.com/thread/958450
Regards
asuvamsi