Unfortuneatly, DHCPadmin.exe won't do it.
I recommend that you backup your DHCP configuration before performing this procedure.
NOTE: This procedure will set the destination to %systemroot%\system32\dhcp\dhcp.mdb.
On the Source DHCP server:
01. Control Panel / Services / Microsoft DHCP Server.
02. Configure Startup as Disabled.
03. At a CMD prompt, type: net stop DHCPserver.
04. Copy the DHCP folder (%SystemRoot%\system32\Dhcp) to \\Destination\c$\Temp\dhcp.
On the destination DHCP server:
01. Install DCHP using Control Panel / Network / Services. Reapply your latest Service Pack and restart the server.
02. At a CMD prompt, type: net stop DHCPserver.
03. Delete the contents of %systemroot%\system32\dhcp, including subfolders.
04. Copy C:\Temp\dhcp to %systemroot%\system32\dhcp.
05. Using Regedt32, navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DHCPServer\Configuration.
06. Select the Configuration key and click Restore from the Registry menu.
07. Enter %SystemRoot%\System32\Dhcp\Backup\Dhcpcfg when prompted for a file name.
08. Press Yes when prompted to restore over an existing key.
09. Exit Regedt32.
10. At a CMD prompt, type: net start DHCPserver.
11. Start the DHCP Manager.
12. Double-click a scope to view the Active Leases dialogue. Reconcile to synchronize the database with the registry.
13. Repeat step 12 for each scope.
