Categories of categories?

Can one create categories of categories in capella? This would be a way to create and logically group subsets of categories together. It would also reduce further clutter on diagrams by simplifying them on a higher level.

E.g. I created two seperate categories, each containing 2x functional exchanges. I now want to create a new category that contains these two as subsets.

Possible? If not, how would I go about creating such logical subsets?

It is not possible to create categories of categories, but one exchange can be part of several categories.
Thus you can create by hand this overall category by listing all the exchanges of your sub-categories.

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