Using Moodle 2.8.7
It's seems to be possible to bulk create cohorts on category level, which means that our departments Moodle admins, added at category level, can do that by themselves.
But when it comes to populating those cohorts this still has to be done in the main user admin panel at Site Adminiatration > Users > Accounts > Upload users with a CSV file to update the users with a Cohort belonging.
Or, have i missed something?