How do I Share Units with a Co-teacher?

In short, you don't have to. Class information will automatically be available to all co-teachers of the class.

Co-teachers can be included on given classes either manually by the teachers (if enabled), manually by administration, or automatically via your SIS schedule.

Co-teachers have identical access to a class including rosters, all Plan items (standards, assessments, units), Grade features (score entry and commenting), and Mastery Reports.