DFL 500 problem

We have a rather big network here and there are little networks
I'm trying to set up my DFL-500 firewall so that one of the little
networks is separated from the rest of the network. The problem
actually is that there still is a server in the large network that I
want to connect to. So I need to open a port or something to get acces
to that server. But I'm not able to do that. Also, I want to get
inside the network protected by the firewall when I'm using a computer
on the larger network.
Is there someone who can help/assist me?
I'm practicing now between my own computer en the entire network and
internet. I'm able to surf on the internet but I cannot get onto the
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