hi, gonna follow this thread as I have same problems. I'm quite new to Prestashop but I've looked everywhere looking for something I've missed, and can't quite find anything. I have made 6 categories, and could add subcategories on the first (what was called HOME), but cannot add sub cat to other 5. I also tried to if there was a way I could copy the whole category and it's subcategories and just rename, but no luck.
I have installed and working on Prestashop 1.6, perhaps, should I have chosed an earlier version?
thanks for those who can help fix this.