One way would be to script out exactly the changes you want to apply, just as if you were doing them at the console or via SSH. On a Cisco device the command structure might be something like this:
conf t
int vlan 10
ip address 10.10.10.10 255.255.255.0
end
wr
Adjust the subnet mask as needed.
NCM can apply that as a script to a specific device by selecting the device in NCM and executing the command script as you'd do it from a console session. But this specific change includes defining the address, and not just the mask, and should not be applied to a set of devices since they'd all end up with the same address on that interface.
If there are multiple devices to re-subnet-mask, the manual method above would have to be applied separately to each switch or router, with the appropriate changes made to the address for each one--again, manually.
I'm looking forward to seeing what other responses come in to this; using variables against a .csv file would be a sweet method for changing multiple devices via NCM.
Swift Packets!
Rick S.