DHCP reservations - Flint 6 AX1800 - multiple networks

I have more than 1 subnet.

How do I create dhcp reservations on a per subnet basis?

It appears to me that if I just use the same mac address and enter the desired IP address in the 2nd subnet this works when I plug the device into the 2nd network.

What was confusing was that it was all in the same list. As opposed to separate “scope” lists for each subnet.