Rollup columns allow you to view progress bars or totals of numeric fields or descendant items within a hierarchy. Descendant items correspond to all child items within the hierarchy. You can add one or more rollup columns to a product or portfolio backlog. You can add rollup columns to a product or portfolio backlog. See {Display rollup progress or totals](backlogs/display-rollup.md).
Rollup provides summed values of select fields for all child work items of a parent. For more information, see Rollup of work and other fields.