Hi
Just in case anyone else want to generate the same report. What you can do it is in SMA, go to Web --> Reporting --> User
In find user search bar type the network with subnet mask in CIDR (e.g. 192.168.1.0/24). It will show all the usage from the IP addresses in this network. But if you have enabled username based logs, this report will not show users usage within that network.
Kind regards
Sakun