Select the Macros tab.
Select the macro you want to change.
Choose Properties from the Edit menu.
The Macro Properties dialog box opens.
Select the option you want to remove from the macro.
The option is removed from the list of options for this macro.
Select Notify DHCP Server of Change.
This selection tells the DHCP server to reread the dhcptab to put the change into effect immediately after you click OK.