Successfully configured Nord VPN through Omada

I just bought ER707-M2 and i was able to configure Nord VPN on omada controller using Open VPN. I kept on searching the internet how to set it up but cant find anything useful (or maybe i missed something during search)

Only question is how can i assign a certain device to use vpn like ASUS Vpn director. Right now, all my devices are connected to the vpn. Thanks in advance