- Open a Classroom and click the button at the bottom of the screen to Create an Announcement, Assignment, or Question
- Notice the new option at the top of the Announcement, Assignment, or Question labeled "All students"
- Click on "All students" to select any combination of students to send the Announcement, Assignment, or Question
- After clicking "Assign", only the students selected will see the Annnoouncement, Assignment, or Question in their Classroom Stream
Read more about this and other new features in Google Classroom at https://blog.google/topics/education/new-google-classroom-features-make-it-easier-learn-teach-manage-and-build/