Share WAN connection with 2 Internal ports on a FortiGate 80C router

I have a Fortigate 80C firewall that has 1 WAN link to the Internet (WAN1) and internally has a connection to my Security Server using a physical connection from Internal1. What I would like to do is add a Wireless Router that uses the Internal2 port that simply goes directly out through the WAN1 port and has internet access without seeing any traffic on the Internal1 port.
I currently have a Virtual IP mapping from WAN1 to the Security Server and a static route my inside network to Internal1 and another from my ISP to WAN1.

How could I configure a second private line on Internal2 without removing the Virtual IP mapping?
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Under Network, click 'switch mode' and change from 'switch' to 'interface'. This will break apart the ports so they are seen as different interfaces. Give int2 an ip on a different subnet and then under the firewall policy create a new policy for int2 -> wan1 with NAT and you're good to go.

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DietmarUKAuthor Commented:
This is exactly what I had done, so was on the correct track. I feel stupid as I missed the DNS address out so the PC had no method of getting to Google.
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