Lambda Solutions recently host another Moodle "Half hour how to moodle" in support of the Moodle community.
Moodle Webinar – Taming the Gradebook
The Moodle Gradebook can be a teacher’s best friend or worst enemy. It has so many features that it can feel overwhelming. Learn how you might approach to building your gradebook as part of the course development process. We’ll cover some tricks to grading your students, as well as how to export those grades to external student information systems. Put the reins on the Moodle Gradebook and get it working for you.
Please see the following recording of the webinar, and slides, which focus on which aggregation methods support your grading structure.