Split a LAN network in two, three or four?

Hi. I’m helping a friends startup company. He’s got a network of several xbox’s, ps3’s, wii’s, about 12 desktops PC with a single fileserver. There are also 5 separate ADSL Modem routers coming in that the devices are configured to use.

All devices are currently on 192.168.1.XXX 255.255.255.0 – we’d like to move the xbox’s, wii’s and ps3’s and a couple of desktops to, say, 192.168.2.XXX, 192.168.3.XXX, 192.168.4.XXX but all being able to see the fileserver on 192.168.1.XXX. Is this possible with subnetting? Do I, or can I use each ADSL Modem Router to bridge the subnets?

Thanks.

Yours,

Confused!