Gradebook cumulative grades can be pulled into lists using the Gradebook Objects in the Select Objects tab of an advanced list.

There are also reports that can be used to pull information about cumulative Gradebook grades that can be accessed by a Gradebook Manager by following these steps:
  1. Navigate to Analysis
  2. Select Reports
  3. From the Category drop-down, select Gradebook
  4. Next to a suitable report (such as Cumulative Grade Export or Cumulative Grades - By Section (Manager)), click Run
Each of these reports displays different information about Gradebooks and can be run to see if the information you are looking for is pulled into the report.