You can group web sites and applications into one category and then look at report for all the selected groups.
Only admins can configure categories and there is only one set of categories for the entire site. Users can not have their own categories, same categories are defined for all users. To start using them, add a site or an app to a category.
You can view category reports on Category pages
On the category page you can see all the same reports as on Applications view, so by hour of day, by time, by user and by all groups which are in the current category.
You can rename or delete a category on category page.