Disable Internet Connection on LAN computers on Linksys E2500

Hi,
I am new here, and going to setting up my router in my small office.
I have a Linksys E2500, and going to disable internet connection on computers that connected via LAN cable.
So, this is how I am going to set my office.
                                                                      Internet
                                                                             |
                                                                      modem
                                                                             |
                                                               Linksys E2500
                                                                (192.168.1.1)
                          |                                                                                                   |
                   Hub A                                                                                            Hub B
     PC 1                     PC 2                                                                PC 3                        PC 4
Hub A and Hub B are in different floor.
Do these Hub A and Hub B still give the same range of IP Address from linksys (192.168.1.x) to the PCs below them, like PC 1 got 192.168.1.2, PC 2 got 192.168.1.3 and go on? Can I reserve an static IP Address to each PCs, and disable internet only on PCs below Hub B (PC 3 and PC 4)? I cannot find any controls for disabling internet connection on LAN interface from the E2500 Setup Interface. There are only Wireless MAC Filtering and no LAN MAC Filtering.
If this thing sounds stupid, I am sorry but I have no experience in setting network here. I hope someone can help me out.
Thanks a lot.

I agree with FurryNutz. You will need an IP-enabled device for the router block it via Parental Controls. If you have wireless bridge or a manageable switch, you can block that and all the devices connected to it should also be blocked from internet access.
I think you can set Static DNS on the computers under Hub B to 0.0.0.0 which will not allow them to access the internet but are still within the router's local network.

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    IPv6-Adresse. . . . . . . . . . . : 2001:0:9d38:6ab8:1098:3e3d:3f57:fe95(Bevo
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    17)Reapply all network configurations in the network preferences panel
    18)Shut down computer once again and turn on
    19)Check airport performance over the next 30 min or so by clicking links actively and waiting
    20)If problem persists you may have corrupted files somewhere and may have to delete some preference files and perform the method above once again (to be safe I suggest running the disk utility test once again)
    note: for some reason Leopard still remembers old network information even after deleting it. you need to find a way to keep leopard from using old preferences (it can be any of them). If all thus fails trash your router settings (on your router, factory defaults) and perform the steps above once again)
    Please report abnormal occurrences like the "self assign ip address problem in network preferences" so we can narrow down where problems are mostly occurring"

    I quote from the System Preferences Help:
    If your computer is connected to the Internet, you can share its Internet connection with other computers on your local network.
    For example, if your computer is connected to the Internet using a DSL modem and has an AirPort Card installed, you can share the DSL connection with other AirPort-equipped computers.
    On Windows computers, sharing your Internet connection is sometimes referred to as a “network bridge” or “bridging your network.”
    To set up Internet sharing:
    Choose Apple menu > System Preferences and click Sharing.
    Select Internet Sharing.
    Choose the Internet connection you want to share from the “Share your connection from” pop-up menu. For example, if you’re connected to the Internet over Ethernet, choose Ethernet.
    Select how you want to share your Internet connection in the “To computers using” list. For example, if you want to share your Internet connection over AirPort, select AirPort.If you share your Internet connection using AirPort, click AirPort Options and give your network a name and password.

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