jacob200,
You can try to generate by creating an Address group first in nPOVisualizer. Specify the IP address you want in Address Groupings. You can actually add additional IP address in every group.
Then generate the Traffic Analysis Report from Custom reports. Choose the group you created.
It would basically show the amount of bytes and applications running on the specific IP address(es) on the group. It would also show the nodes (users) that have communicated with these IP's.
Hope this helps.
Regards,