How to add a new attribute in this part "New social/fiscal tax "

Hi in Home->Setup->Dictionaries-> Types of social or fiscal taxes

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it’s not this part “Home->Setup->Dictionaries-> Types of social or fiscal taxes” this part for adding category in at attribute “type”
Actually I want add a new attribute

These are fixed tables and you cannot add extrafields like you do in modules.
If you have a valid use case though and useful for others, you can make a feature request in the projects GitHub page for a new attribute field to be added.
What is your actual use case?