ER-X openvpn client + normal network question

hello

after reading some manuals from network by glueing them i finally setup ER-X like that:

-openvpn client connected to nordvpn provider + vpn killswitch (if vpn connection will drop er-x doesnt allow packets on wan eth0)

-nordvpn dns instead of my isp dns added to the wan port eth0

-wan eth0 input = lan eth1 to eth4 openvpn outputs

all lan ports give me openvpn tunelled connection

what i need exactly to fix right now is:

new options:

-receive openvn tunnel on eth1 throuth eth0 (wan) only

-receive my isp network clear ip on eth2 - to eth4 througth eth0 (wan) with standard dns from isp

does anybody could explain how i can setup it to get new options ?

this is my actuall config:

firewall {
    all-ping enable
    broadcast-ping disable
    ipv6-receive-redirects disable
    ipv6-src-route disable
    ip-src-route disable
    log-martians enable
    name WAN_IN {
        default-action drop
        description "WAN to internal"
        rule 10 {
            action accept
            description "Allow established/related"
            state {
                established enable
                related enable
            }
        }
        rule 20 {
            action drop
            description "Drop invalid state"
            state {
                invalid enable
            }
        }
    }
    name WAN_LOCAL {
        default-action drop
        description "WAN to router"
        rule 10 {
            action accept
            description "Allow established/related"
            state {
                established enable
                related enable
            }
        }
        rule 20 {
            action drop
            description "Drop invalid state"
            state {
                invalid enable
            }
        }
    }
    receive-redirects disable
    send-redirects enable
    source-validation disable
    syn-cookies enable
}
interfaces {
    ethernet eth0 {
        address dhcp
        description Internet
        dhcp-options {
            default-route update
            default-route-distance 210
            name-server no-update
        }
        duplex auto
        firewall {
            in {
                name WAN_IN
            }
            local {
                name WAN_LOCAL
            }
        }
        mac xxxxxxxxxxxxxx
        speed auto
    }
    ethernet eth1 {
        description Local
        duplex auto
        speed auto
    }
    ethernet eth2 {
        description Local
        duplex auto
        speed auto
    }
    ethernet eth3 {
        description Local
        duplex auto
        speed auto
    }
    ethernet eth4 {
        description Local
        duplex auto
        speed auto
    }
    loopback lo {
    }
    openvpn vtun0 {
        config-file /config/auth/xxxxxxxxxxxxx
        description vpn
        hash sha1
        mode client
        openvpn-option -comp.lzo
        remote-host xxxxxxxxxxxx
    }
    switch switch0 {
        address 192.168.1.1/24
        description Local
        mtu 1500
        switch-port {
            interface eth1 {
            }
            interface eth2 {
            }
            interface eth3 {
            }
            interface eth4 {
            }
            vlan-aware disable
        }
    }
}
service {
    dhcp-server {
        disabled false
        hostfile-update disable
        shared-network-name LAN {
            authoritative enable
            subnet 192.168.1.0/24 {
                default-router 192.168.1.1
                dns-server 192.168.1.1
                lease 86400
                start 192.168.1.38 {
                    stop 192.168.1.243
                }
            }
        }
        use-dnsmasq disable
    }
    dns {
        forwarding {
            cache-size 150
            listen-on switch0
            name-server xxxxxxxxx
            name-server xxxxxxxxx
            system
        }
    }
    gui {
        http-port 80
        https-port 443
        older-ciphers enable
    }
    nat {
        rule 5011 {
            description test
            log disable
            outbound-interface vtun0
            type masquerade
        }
    }
    ssh {
        port 22
        protocol-version v2
    }
}
system {
    host-name ubnt
    login {
        user root {
            authentication {
                encrypted-password $6$CKAWyfG.ABK0$6VuttyVvGR4626XbRuOKWfBnyR6/R.QBFvEh0GXwosNdFP5QQvRfmAGhb86uSjBwOiCfpu4ntJY.YF/2bukoJ0
                plaintext-password ""
            }
            level admin
        }
        user ubnt {
            authentication {
                encrypted-password $6$3QeCM7YtNGEO$Fdxjccog6mpUufpy.zpo3yXHs1lriLE6sd.2jz95GML.414qj5Y07E.yfrBdRms147jfRt..czXX5M1OzJ3X.
                plaintext-password ""
            }
            level admin
        }
    }
    name-server 127.0.0.1
    ntp {
        server 0.ubnt.pool.ntp.org {
        }
        server 1.ubnt.pool.ntp.org {
        }
        server 2.ubnt.pool.ntp.org {
        }
        server 3.ubnt.pool.ntp.org {
        }
    }
    syslog {
        global {
            facility all {
                level notice
            }
            facility protocols {
                level debug
            }
        }
    }
    time-zone UTC
}


/* Release version: v1.9.0.4901118.160804.1131 */

thanks

-xian1