IpCop and 3 networks.

I am on my customer´s network and I´m using IpCop as VPN server, Firewall and internet gateway.
I want to allow access between the customer´s network and my office network so I want to setup something like this:

CUSTOMER´S NETWORK
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IPCOP SERVER -- INTERNET
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MY NETWORK

How can I setup this with IpCop? If i set the Customer´s network as a BLUE network I must open all needed ports using DMZ Pinholes and this is impossible due to the number of settings to do but I don´t see another way.

Please, help

Thanks all.

Easiest way is to have an IPCOP on your end as well as your customer's. That is if you must use VPN. I find it easy to have just the IPCOP at the customer's site and use SSH. If you are still going ahead with his project, post a reply with your progress and I will help you out.