How to duplicate Category, create subcategory or parallel list [CB v4.1]


I would like to duplicate the Category that appears below each video, for example to use it as a sub-category or a new set to be added separately, so I would like to create a new parallel list in the database, a new CB function and so on by talking about linked to the Category function. Could you tell me which documentation to refer to in order to develop a plugin specifically?

I found this
How do I create a new function in CB v4.1? Do you give me advice on where to look to copy the Category and create a new one?