After reading the advice in this forum, I attempted to expand a range.

I exported the subnet using the DNS/DHCP Management Console.
Then edited the exported file, changing only the ending address of the
Deleted the subnet in DNS/DHCP Management Console.
Deleted the subnet in NWADMN32

When I attempt to import the modified file, DNS/DHCP Management Console
never finishes.
It displays:
The import program is updating the database. Please wait while the
transaction occurs.
Transferring IP address configuration to NDS.
NDS 7.61
dhcpsrvr.nlm 3.12f
management console recently reinstalled from dnsdhcp3.exe

advice please?
.....Gregg Nicholas