By default, users can view all the courses in the Udemy for Business collection, but you can assign courses to any user or group if you wish (please note: this option is only available to Enterprise Plan users).
To assign a course, navigate to the Manage tab and click on Courses. Use the search field to find the course you want to assign.
Once you have found the correct course, click the Assign Course drop down menu to assign the course.
Once the course has been assigned, the user(s) will receive an email notification and the course will appear in their My Courses view as if they had enrolled on their own.
You can see which users are assigned to a specific course, and review their course progress via a User Course Activity Report.
At the moment, the option to unassign a course is not available.