Will you ever use main term sub term and sub sub term at the same time?

Yes, it is possible to use main terms, sub-terms, and sub-sub-terms simultaneously, especially in structured contexts like hierarchical classification systems or detailed subject indexing. For example, in academic writing or research, a main term might represent a broad topic, while sub-terms and sub-sub-terms provide specific details or categories related to that topic. This layered approach enhances clarity and precision in communication.