Using ip-helper without using DHCP functionality

Hello,
I am fairly new to Cisco, and am after a bit of help.
My scenario:
We have a new domain setup on a new VLAN (3), seperate from our current infrastructure VLAN (2).
The new domain controllers provide DHCP for our new servers, and I would also like them to handle DHCP for wireless clients.
We have one DHCP scope 10.0.0.0 255.255.0.0, and I would like to assign all wireless clients an IP in the 10.0.6.0 range.
My thinking on the best way to do this, is with a DHCP policy, that looks at the relay agent information.
I would then set the ip-helper address, on the port the wireless access point is connected to on the Cisco, to point to the DHCP server.
Then for that same port, I would seb a subscriber id in the relay agent information, and use this string to set the IP assigned to that device.
Looking into doing this, it seems the Ciscos DHCP functionality has to be turned on in order to use ip-helper.
In my config, I cannot tell if DHCP is enabled or not, I can see neither "service dhcp", nor "no service dhcp" in the config.
Assuming I were to turn it on using "service dhcp", can I then leave the actual functionality turned off? i.e. turn on the DHCP service, but not have it assign IP addresses?
Also, does turning it on cause any downtime or disruption?
I think I have to run these commands:
conf t
service dhcp
interface GigabitEthernet2/40
Ip helper-address 10.0.0.1
Ip dhcp relay information option-insert
Ip dhcp relay information option subscriber-id “wireless”
I know these are probably simple questions, so please forgive my ignorance.
James

Ok here goes.
On my domain controller/DHCP server, I have a scope setup of 10.0.0.0 255.255.0.0, and is set with an IP range of 10.0.0.1 - 10.0.6.253
I have various reservations in place, and a working policy to assign thin clients an IP of 10.0.2.X based on their MAC address.
I have then created a second policy, that should be assigning IPs in the 10.0.6.0 range, based on relay agent information, subscriber ID. This is a HEX value, so whatever string I enter on the Cisco, has to be converted to HEX.
This DHCP server is on the same VLAN 3. The VLAN interface on the Cisco has IP of 10.0.0.254 255.255.0.0
The wireless clients are getting IP addresses, but not within the range specified by the policy, so they are getting any address between 10.0.0.1 and 10.0.6.253 that is not already in use.
Image 1 shows the vlan interface, where I have set the helper address, relay information option-insert, and subscriber id of "wireless".
Image 2 shows the config on the port that my access point is connected to.
Image 3 shows the value of the policy on the DHCP server, based on subscriber ID
Image 4 shows the string "wireless" converted to HEX
Image 5 shows the IP range that the policy should be using
Image 6 shows "Edss-iPhone" as have an IP not within the correct range
Hopefully that helps.

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