Unless you are using VMWare, or you have multiple machines to run more than 1, you can't as far as I know. Though, even if you have more than 1 PC to run your servers, you can still only have 1 public server per IP. This is because your router will be forwarding port 9000 and that forwarding can only go to 1 of your IP addresses. Players need that port in order to connect, so your other servers with different IPs won't work.
It may be possible that you can run more than 1 server on the same IP/PC, but I haven't ever really tried that. Maybe it would work if you had 2 separate install directories for the servers and 2 separate databases for them to use.
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