Navigate to NETWORK | System > DHCP Server | DHCPv4/6 Server Settings.
Click Advanced. The DHCP Advanced Settings dialog displays.
Available options differ depending on whether you are configuring an IPv4 or IPv6 option (see IPv6 DHCP Advanced Settings or IPv4 DHCP Advanced Settings).
Click Option Groups.
Click Add Group. The Add DHCP/v6 Option Group dialog displays.
Enter a name for the group in the Name field.
Select an option object from the left column and click the Right Arrow to add the option object to the In Group. To select multiple option objects at the same time, hold the Ctrl key while selecting the option objects.
Click OK. The group displays in the Option Groups table.