Help to setup Web Filtering Exception with Time Period Definition

I have setup a 'Time Period Definition' and want to configure Web Filtering Exception under Sophos UTM 9 to have access at particular time (mentioned in Time Period Definition) to a required URL. I cannot find ALLOW where I can select 'Time Period Definition' under Web Filtering -> Exceptions, there are four options and none of them have any settings for ALLOW.
I need help to setup a Time Window to Access a particular URL automatically when time arrives. Thanks!