Within the time dimension, months roll up to quarters, quarters roll up to years, and years roll up to all years.
Within the product dimension, products roll up to subcategories, subcategories roll up to categories, and categories roll up to all products.
Within the customer dimension, customers roll up to city. Then cities roll up to state. Then states roll up to country. Then countries roll up to sub-region. Finally, subregions roll up to region.