Each Zone on an OmniBridge has it's own DHCP settings.
When using the OBR as a DHCP server reservations can be made through the Portal.
Steps - Portal
Login to the Portal
Edit the Subscription
Go the Zones tab
Choose the Zone needed
Scroll down to the "Zone Clients" section
Find the device by name or MAC address
Enter the IP address desired
Click the Lock icon to Save
Steps - End device
The end device will need to release and renew it's DHCP reservation if the address is different than before.
Please see the devices instructions on how to do this.
Steps - Remove Reservation
Return to the Zone Clients section
Click the blue lock icon to unlock the reservation