Bypass OpenVPN for Select IP

I have IPFire set up with a VPN using OpenVPN. All traffic is directed through the VPN and all is working as expected.

I now have a need for traffic from one of the internal IPs on the green network to route through the normal ISP connection versus being routed through the VPN.

This type of setup appears to be called policy based routing or split VPN as best I’ve been able to tell.

Has anyone done anything similar with IPFire and can provide some general pointers or references to setup instructions?

Thanks in advance.