How to Configuring if I need NetFlow Export more interface?

How to Configuring if I need NetFlow Export more interface?

#ip flow-export source FastEthernet 0/1 ??????????
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router#enable
Password:*****
router#configure terminal

router-2621(config)#interface FastEthernet 0/1

router-2621(config-if)#ip route-cache flow

router-2621(config-if)#exit

router-2621(config)#ip flow-export destination 192.168.9.101 9996

router-2621(config)#ip flow-export source FastEthernet 0/1

router-2621(config)#ip flow-export version 5
router-2621(config)#ip flow-cache timeout active 5
router-2621(config)#ip flow-cache timeout inactive 15
router-2621(config)#snmp-server ifindex persist
router-2621(config)#^Z
router#write

router#show ip flow export
router#show ip cache flow