The company consists of three subsidiaries, each carrying its own area of concentration. (? - that’s just a guess; more information about the nature of the company might reveal a more specific meaning.)
Also, notice that a company ‘consisting of subsidiaries’ is a little odd, since presumably the company is a larger entity with 3 subsidiaries but also with considerably more in and of itself.
I don’t see how that meaning would work with the wording “each carrying its own AOC”. I wondered if it meant “Appellation d’origine contrôlée” (a wine certification), but it’s just a random guess…