Mapping ports to internal servers

I am running sbs2000, isa server is up and running we are trying to get
ISA to map about 15 ports from the external address to a specified
internal machine so as to act as a virtual server, we have just replaced a
hardware firewall with isa and the hardware acomplished this by specifying
the ports under a virtual server isa I seem to be going
round in circles......please help..........cheers

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