View, update and filter account balances in child table

Hi,

I made a custom doctype in which I have child table. In the table I want to view various account balances and be able to update them if needed. Also, I want to filter the account balances being shown according to a certain project.

Help needed as I am unable to accomplish any of these tasks. Tried to find similar scenarios on the ERPNext forum but no luck.

Thanks.