Allow units to be assigned to TEACHER, and not a class/year.
Create a TEACHER lesson bank, organized by units. Allow teachers to assign the lesson they create to a unit, and be able to access that unit/lesson bank from ANY class ANY year.
You can now create Lesson Banks, with units and lessons, to store curriculum outside of your class schedule.
Lesson Linking, when combined with Lesson Banks, provides teachers and schools with a powerful curriculum management tool. Teachers can collaborate on the development of curriculum (classes, units, lessons), store the curriculum in lesson banks, and set permissions for who can view or edit the banks.
Teachers can then either COPY or LINK the lesson banks into their plans. COPY will allow teachers to create a new set of lessons that are solely for their individual use. LINK will establish a link to the source lesson, such that any changes made will automatically show in both the source and the target lessons of the link.
To learn more, visit our knowledge base at https://planbook.uservoice.com/knowledgebase/articles/1947022-the-copy-screen