Thread: How to add subcategories to 3000+ parent categories?

How to add subcategories to 3000+ parent categories?

I have added 50 States (as parent categories) & 3000+ Counties (as subcategories) now I wish to add general categories to those 3000+ subcategories; such as Cars, Clothes, Food etc.

How may I add a handful of general categories, to 3000+ subcategories without doing this manually? It took me over a week to add the counties manually, nearly got carpel tunnel! LOL

Thanks guys!