we have the same problem (three years later we see) over 1000 branches with different subnet each one in a large organization (over 100,000 managed
We can easily import Subgroups and workstations.
However our challenge is to sort these groups with the relevant IP Subnets.
Entering the sorting criteria ip address range with the subgroup text file would assist a great deal,
or you could simply configure the IP range to sort of subgroup, acquiring the IP range directly (through a specific action)
from one of these systems operated within the same subgroup.
But as no one has ever thought?