Category hierarchy defines the structure of the product catalog. You can build and maintain a category hierarchy on the Category page. You can add sub-categories (also known as nodes) to a category, add an image, reorder categories, and associate products, thus building a hierarchy. Most implementations will have an existing hierarchy.
You can create multi-level categories. For example: .
Prerequisite
You must have an existing Offering category.
A category hierarchy is built. The hierarchy is visible on the left-hand side of the Category Manager page. After building the hierarchy, you must run the Category Maintenance batch job.