Register Taxonomy

    register_taxonomy(
        'portfolio_category',  //The name of the taxonomy. Name should be in slug form (must not contain capital letters or spaces).
        'portfolios',                  //post type name
        array(
            'hierarchical'          => true,
            'label'                         => 'Portfolio Category',  //Display name
            'query_var'             => true,
            'show_admin_column'             => true,
            'rewrite'                       => array(
                'slug'                  => 'Portfolio-category', // This controls the base slug that will display before each term
                'with_front'    => true // Don't display the category base before
                )
            )
    );
    register_taxonomy(
        'portfolio_menu',  //The name of the taxonomy. Name should be in slug form (must not contain capital letters or spaces).
        'portfolios',                  //post type name
        array(
            'hierarchical'          => true,
            'label'                         => 'Portfolio Menus',  //Display name
            'query_var'             => true,
            'show_admin_column'             => true,
            'rewrite'                       => array(
                'slug'                  => 'itams', // This controls the base slug that will display before each term
                'with_front'    => true // Don't display the category base before
                )
            )
    );