Brijesh is correct - NAP DHCP enforcement does not work in this fashion. It keeps the client on the same IP address within the same subnet, minimizing network disruptions. However, it does lock down the connection, allowing communications only with IPs given in the fixup list.
However, if you wish to move clients from subnet to subnet (or vlan to vlan), Brijesh is again correct - this is a functionality provided by 802.1x switch (or AP) based enforcement.
-Chris
Chris.Edson@online.microsoft.com *
SDET, Network Access Protection
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** This posting is provided "AS IS" with no warranties, and confers no rights.