Im using the Untangle Servers OpenVPN. Do I need to create extra virtual racks/policies for the VPN users?
You do not have to create extra virtual racks/policies to use VPN. The VPN interface is, by default, inside the external and DMZ interfaces, but outside of the internal interface. The single Default Rack is sufficient for most deployments. One case where you would need to create extra virtual racks/policies is when not all VPN users are equal and you want to apply different rules to different VPN users. If all VPN users are equal, have the policies dealing with the VPN interface route traffic to the Default Rack.