Netstream Export Multiple Sources on 3COM

I have a 3Com 5012 router that I am trying to setup netstream exports to a Netflow monitor.

I am able to configure it so that one interface will stream (and working) but I'm confused on how to set multiple interfaces as the source.

Here is the export config
Version 5 export information
Stream destination IP(UDP) : 192.168.1.3(9996)
Stream source interface : Ethernet1/0
Exported stream number : 12277709
Exported UDP datagram number(failed number): 2572184(0)

If I type the following command, it will change the source instead of adding another.
ip netstream export source interface ethernet 1/1

How do I make it so that I can choose multiple interfaces as the source? I have a command manual but I can't find anything about this specifically.

Thanks