Here is a pretty good guide to creating relationships in Access. NOTE that the relationship between Students and Courses in this example is M:N...thus the Enrollment table is created to break up that many to many into TWO one to many relationships. Further, while she suggests using Cascading update and delete, I usually hesitate with those, only because you can do more damage than good with those enacted.
I would look over pages 807-844 in your book.
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