To add a static persistent route in pbxware v5 VPS you must do following,
nano /etc/local.d/customroute.start (customroute can be changed as long as it ends with .start)
ip route add 192.168.2.0/24 via 10.1.0.50 dev eth0 ( if you do not need gateway you can remove via 10.1.0.50 from the example )
chmod +x /etc/local.d/customroute.start
After rebooting the VPS check with route -n if the route exists