My website have many posts, ~9 main categories and “unlimited” subcategories.
I’d like to force in WordPress panel that you can’t choose more than 1 top level category but you can choose unlimited subcategories of this main one.
One plugin changed checkboxes into radiobuttons and it works great but only for one level and I need more depth.
Is there any way to do that? Thanks in advance.
Read more here:: Limit post top level categories to one