Adding Taxonomies to Custom Post Type Without Displaying Blog Post Categories

Question

I am running into an issue that I am trying to fix. I first needed to find a way to add a category page to custom post type. Which I was able to do with this following code added to the mu-plugin file.

'taxonomies' => array('contractors', 'category'),

However, the problem is that when I select the category page for the custom post type "contractors", I also get all of the categories for the blog post in the same page. I only want the page in the admin panel to display categories for different types of contractors. Not for all of the post types in the website.

When categories in contractor post type is selected. I get this following URL destination in the admin panel. However, it also comes with all categories previously created for blog post. Need to omit those from this category.

/wp-admin/edit-tags.php?taxonomy=category&post_type=contractors

How can I get rid of all of the categories not associated with this custom post type?

Thank you

Answer 1

Thanks to @Jacob Peattie for pointing me in the right direction. I was able to get the code to display exactly what I needed it to with the following syntax. My intent was to get an admin level category page to only display new categories for contractors like painters, fencing, roofers, etc. Initially, it redirected me to the blog post categories which I didn't want to use. Now with the following register_taxonomy function, I was able to get a new admin page for the contractor's categories.

    // Contractor Post Types
register_post_type('contractors', array(
    'show_in_rest' => true,
    'supports' => array('title', 'editor', 'excerpt', 'thumbnail','taxonomies'),
    'rewrite' => array('slug' => 'contractors'),
    'has_archive' => true,
    'public' => true,
    'labels' => array(
        'name' => 'Contractors',
        'add_new_item' => 'Add New Contractor',
        'edit_item' => 'Edit_Contractor',
        'all_items' => 'All Contractors',
        'singular_name' => 'Contractor'
    ),
    'menu_icon' => 'dashicons-admin-tools',
    'taxonomies' => array
    (
        'contractors_category',
        'post_tag'
    )
));

// Registering the contractor taxonomy
   register_taxonomy('contractors_category', 'contractors', array(
        'label' => 'Categories',
        'rewrite' => array('slug' => 'contractors-category'),
        'show_in_rest' => true,
        'hierarchical' => true
   ));

    // Registering the contractor tags taxonomy
   register_taxonomy('contractors_tags', 'contractors', array(
        'label' => 'Tags',
        'rewrite' => array('slug' => 'contractors-tags'),
        'show_in_rest' => true
   ));