This forum is to discuss different features/issues of Oracle Financials modules ( GL - General Ledger, AP - Accounts Payable, AR - Accounts Receivable, FA - Fixed Assets & CM - Cash Management ).
According to my understand from your description, you set 1 account for tax so you can define the other accounts by query about the tax supplier you have & define the other accounts as a sites.
Please confirm if I understand your question or you mean other problem.