This BEP introduces the partOf relationship, similar to that found in the Gene Ontology and other biomedical ontologies. It also deprecates the subProcessOf and hasComponent relationships in favor of using the partOf relationship.
The full text of this BEP can be found at https://github.com/belbio/bep/blob/add-bep-0010-part-of/docs/drafts/bep-0010.md