Within TrustOpen, learning contents and learning objects are organized within two types of structures.
At macro level, disciplines, subjects and topics are oreganized in hierarchies that guide the development of courses and programs. Topics of a subject are usually taught in one course or two. An academic program is made of a group of courses, which may belong to different discipline.
So, subjects are nodes right under diciplines but above topics in the diciplines/subjects/topics hierarchy
At micro-level, knowledge and learning objects are networked.
USubjects should be added under each respective discipline. So, try to add subjects within the discipline app.