For example, if you want to set the gateway as "192.168.1.200" on the client (with IP "192.168.1.100"). Please create a text file named "192.168.1.100.txt" with content -

netsh interface ip set address "Local Area Connection" gateway=192.168.1.200 gw=1

And put 192.168.1.100.txt in C:\CCBoot\CMD folder. After restart this client, its gateway will be changed as you set.