Hi, in new installs of 9.5, the ability to import custom reports is disabled by default. It can be re-enabled setting a value of 1 for the registry setting HKLM\Software\WOW6432Node\BigFix\Enterprise Server\BESReports\AllowCustomReportCreation.
Here are more details: http://www.ibm.com/support/knowledgecenter/SS6MCG_9.5.0/com.ibm.bigfix.doc/Platform/Web_Reports/c_creating_a_custom_report.html
And in case it’s useful, there is a screenshot in a related discussion here: Bigfix 9.5 import Custom Webreports option not coming