Hi BK,
Your questions must be part of the assessment. I think your client wants to know whether they have too many accounts, duplicate accounts or unused accounts etc. Please involve a development resource, then tell him you need affected WRICEF objects by the account fields in the BS* tables. On top of that you need to see whether the balances of these accounts were zero for current and previous years.
Account / Chart of Accounts change is a very strategic decision in the existing implementations, since it affects literally everywhere. Be aware that it will be a huge task to change/eliminate such accounts from the CoA.
I didn't understand your query about the below, can you elaborate?
Can we put any additional thoughts to enhance the GL accout with specific T-code.
regards,
Dave