Changing your default bank account
If the bank account that appears when you open the transaction entry window isn't the one you generally use to pay your vendors or receive payments from customers, you can change it.
To change the account used for receiving payments in the Receive Payments window and the Applied Payment Details window, choose Setup menu>Linked Accounts>Receivable Accounts to display the Sales Linked Accounts window. In the Bank Account for Customer Receipts field, enter or select the correct account for your receipts, then click OK.
To change the account used for paying vendors in the Pay Bills window, choose Setup menu>Linked Accounts>Payable Accounts to display the Purchases Linked Accounts window. In the Bank Account for Paying Bills field, enter or select the correct account for your vendor payments, then click OK.