The Progress > Run Rollup command uses the information defined for every deliverable in every workpack that is included in the rollup to calculate the current level of completion of each workpack, when applicable. Once the roll-up has been performed, the information is stored for that particular cut-off date, and the information is available for viewing through the View Progress dialog box.
Progress is calculated at every level of the hierarchy, including every deliverable
associated with every workpack, so for larger sets of data, this process may take
some time.