You may need to search or filter your page/portfolio by an extra taxonomy, such as category or Tags.

I want to add an another taxonomy so the WP Ultimate Post Grid can create an extra filter by that.

I will add a new taxonomy below to enable another type of portfolio filter.

To manually add a taxonomy, do below:

 

add_action( 'init', 'create_subjects_hierarchical_taxonomy', 0 );



function create_subjects_hierarchical_taxonomy() {

// Add new taxonomy, make it hierarchical like categories
//first do the translations part for GUI

$labels = array(
'name' => _x( 'Customization', 'taxonomy general name' ),
'singular_name' => _x( 'Customization', 'taxonomy singular name' ),
'search_items' => __( 'Search Customization' ),
'all_items' => __( 'All Customization' ),
'parent_item' => __( 'Parent Customization' ),
'parent_item_colon' => __( 'Parent Customization:' ),
'edit_item' => __( 'Edit Customization' ), 
'update_item' => __( 'Update Customization' ),
'add_new_item' => __( 'Add New Customization' ),
'new_item_name' => __( 'New Customization Name' ),
'menu_name' => __( 'Customizations' ),
);

Then register the taxonomy:

// Now register the taxonomy
register_taxonomy('Customizations',portfolio, array(
'hierarchical' => true,
'labels' => $labels,
'show_ui' => true,
'show_in_rest' => true,
'show_admin_column' => true,
'query_var' => true,
'rewrite' => array( 'slug' => 'Customization' ),
));

}