The Plugin will help you easy to add Custom Taxonomy to your Post, Custom Post Type. You just input the post_type and The Name of Taxonomy, You should tick to hierarchical option: will become Category or become Tag); If you want to update, remove the existing taxonomy just go to page MCT_All, this page will be used to manage your added custom taxonomy Ordered list: – Existing Custom Post Type Slug: the slug name from post_type, which is the one you want to add custom taxonomy – New Taxonomy Name: the name of Custom Taxonomy, which you want to add. will be display on the admin menu – New Taxonomy Slug: add the slug of the custom taxonomy, which you want to add