Odhcpd start address

Is it possible to set odhcpd to start dhcp from instead of the start of the address pool ?

I have a pool and i want to put 2 dhcp service one that cover and one that cover

Yes, just specify "256" as the start value.

On the other hand, I am wondering why and how are you going to have two pools in the same network.

where i set this value ?