HR Form Deal with two bank accounts

we have a customer, whoes employee may have two banks. So they'd like to get the result in the payslip as follows.

1. if there is just one bank, the output result will be

boc xxxxx(amount)

2. if there is more than one bank, the output result will be

boc XXX

other bank XXX

we know that if there is just one bank, the Ttansfer assignment is space or 01, the bank will be boc;

but if more than one bank, the tbank of boc's ransfer assignment will be 02, 01 will be the other bank.

If there any idea?