He's asking about sub-classes that have multiple options. Totem Warrior, for example, has 3 additional choices within the subclass. A Berserker is a Berserker, but a Wolf Totem Warrior is different than a Bear Totem Warrior, even though they have the same sub-class.Are you just asking about subclasses? Or are subsubclasses somehow a thing?
I don't like the warlock thing, where they have two subclasses, if that's what you're asking (though I don't think you are).
I can kind of see where you're going with the Storm Herald Barbarian, even though I've never heard of it before. It sounds a lot like the Dragon Sorcerer.I'm talking about subclasses with an extra choice Point.
Like Totem Barbarian can choose between Eagle, Elk, Tiger, Wolf, Bear totems.
Storm Herald Barbarians can choose Desert, Sea, and Artic.
These act like a subclass within a subclass.