- Navigate to Setup > App Setup > Contacts > Fields
- Under Contact Custom Fields & Relationships, click "New"
- Select "Roll-up Summary", click next
- Enter Field Label and Field Name, then click next
- For Summarized Object, select "Shift Assignments"
- Select Roll-up Type "Sum", and the Field to Aggregate "Credit Hours"
- Select "only records meeting certain criteria ..." and use the following filter: "Attended equals True", and click next
- Make the field visible for appropriate profiles, click next
- Choose page layouts, and click save
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