Create a sub network in Windows

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http://serverfault.com – Hello I have the following network setup A, B, C and D are pc's with windows installed. A has internet access via a PCI wifi card and its connection is bridged to the ethernet port and then given to a switch with provides connection to B, C and D. I want to block internet access to B, C and D. 'A' is part of private network with static ip 192.168.0.xxx is it possible to create another private network on A, like 10.0.0.x and then B, C and D become part of this private network. I need to do this so that I can install some custom software on A and distribute it to B, C and D so it would be (HowTos)