Our teachers often create an assignment and share/publish it to all of their sections.  This is problematic if a teacher needs to go back and delete the assignment from one of the sections.  Even if there are no grades for that assignment in the section, it cannot be deleted because there are grades in other sections.  It would be helpful to be able to break the sharing connection, leaving a copy of the assignment in each section so that one could be deleted while leaving the other and its grade data.