It's useful to be able to decide what shows up in the Credentials section and where.
Learners would benefit to have a clearer understanding of what they've completed.
There are several ways this could work:
A choice in the Curriculum set up to choose what shows in the Credentials (Curriculum, Courses or both)
Have a Curriculum section in the Credentials that shows completion status for the Curriculum; the courses within the Curriculum could still show in the Courses section.
Have another column in the Courses section that has Curriculum/Curricula that it belongs to, and then not list Curriculum separately.