Customer Accounts reading on multiple shifts

hi i have multiple shifts and I see if I pull my sales fro the cashier it includes the Customer Accounts.
Sales||[=F(TN(’{ACCOUNT TOTAL:Cash1}’)+TN(’{ACCOUNT TOTAL:Credit Card1}’),‘0.00’)]
now the Customer Accounts value is the total value for work period so it is throwing my whole cashup calculation out. Is there any way I can specify which cashier did what Customer Account Payment?