You can summarize data at any time or you can use the Scheduled Services page to schedule a time when data are regularly summarized. For example, set the application to summarize every Monday at 8:00 a.m. In each case, project data are summarized according to the settings you specify and the new summary values are saved to the project database, overwriting any previously calculated summary data. If you run the summarizer from the Scheduled Services page, you can select to summarize an EPS rather than individual projects. Otherwise, an EPS node uses the sum of all the project records beneath it.
Resources
Resource-related features in P6 that use summary data rely on the creation of enterprise (EPS) resource records. Each record is the sum of all assignments for a resource. When you summarize a project, the application creates resource records for that project. Each time the service runs, the records are updated.