The report you are likely refering to is 'Windows Server Update Services Analytics' -> 'Approval Summary with percentages and computer counts'. Modify that report and add the field in the 'Approved Updates Installation Summary Info' datasource called 'Update Classification Title'. Remove the fields 'Update Title', 'Security Bulletins' and 'Release Date' as you will no longer be reporting by individual update but rather by classification. This should give you what you are looking for. Feel free to email www.solarwinds.com/customerportal should you have additional questions.