How to set “section categories”?

I’ve made a custom post type “Artwork” with CPT UI. In the settings of my CPT, I enabled access to these taxonomies “Categories” and “Section Categories”.

When I view my post list, I not only see a column “Categories”, but also a column “Section Category”. See screenshot.

But where can I assign a section category? There is no taxonomy for section categories. Do I have to create a custom taxonomy and give it a certain name to make it act as “Section Categories”?

I couldn’t find any information online…

EDIT: Here’s a screenshot that hopefully explains my problem in a better was.

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