subcategory in form

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Hi there,

I want to make the category list like an alphabetical list (with a-z headers)
and i figured the easiest way to do so was making a-z the main categories and then my normal main categories as subcategories under it, but i was wondering, is there a way to make the subcategories the only ones showing up in the category field on add listing form (so it wont show the a-z options)?