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Sub-category with comments only – possible?

I am trying to make a forum where I can make a category with some sub-categories, and within those sub-categories the users can only comment, not make their own topics. For example if I make a category called “Travelling” and the sub-categories are USA, Australia, Vietnam, Brazil and so on then I dont want people to be able to make a topic within this sub-category. For example within the USA sub-category I the users shall not have the possibility to make a topic called “California”, which others can then comment on. I just want one single continous thread, where people can answer only.

Is this possible?

I have been through settings numerous times, but cant find a solution. Hope somebody can help.