Are you talking about Custom on the Explore Data page? It is still there on my 10.0.4.32. Also, if you are testing session Relevance you can use the QNA page in Web Reports.
Also, you can check that the Registry Entries for AllowCustomReportCreation and AllUserViewCustom in the following location are both set to 1.
HKLM\SOFTWARE\Wow6432Node\BigFix\Enterprise Server \BESReports.