Host:
route add 8.8.8.8 mask 255.255.255.255 192.168.1.123 if 1 -p
Network:
route add 10.20.30.0 mask 255.255.255.0 192.168.1.123 if 1 -p
Run in terminal as admin: Diskpart list disk select disk 0 list partition select partition X delete partition override