During the build of a new Domain Controller that has DHCP enabled I was wondering how I can get the DHCP reservations off the old server to the new server. I stumbled upon this set of commands that saved my life.
On the existing (old) server:
netsh dhcp server export C:\dhcp.txt all
Copy the txt file to the new server, and run this command.
On the new server:
netsh dhcp server import C:\dhcp.txt
Seems to work great, and saved me a ton of time.