which ip scheme i have to prefer?

I have 1 gateway pc for all networks - 192.168.0.254
( that i can change any way)


now i want Hierarchy like -- 1 gateway
/ \
1 company 2 company
/ / / /
1 dept 2 dept 1 dept 2 dept
/ /
1 lab 2 lab

Now i want all network to be connected with same gateway.
and all networks can access each others pcs ( labs, dept, companies)

Plz. suggest me the ip range , which i have to prefer for the upper
diagram.

I also want that at any time i can chage ( disconnect) 2 different
labs , with the help of command line, (As physical disconnection of
cable is not preferable)


Suggest me some solution that i can implement for the network

Thanks

Regards

debug

.

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