Events Schedule Custom Taxonomy

wcs_custom_tax.php

add_action( 'init', 'wcs_register_custom_taxonomies' );

function wcs_register_custom_taxonomies(){
  register_taxonomy(
    'custom_tax',
    'class',
    array(
      'label' => esc_html__( 'Custom Tax Name', 'text-domain' ),
      'rewrite' => array( 'slug' => 'custom_tax_slug' )
    )
  );
}

NM figured. Is there a way to change the order of it. I mean, as is now it shows as the last filter but I need that to be the second after the class types.

You have to add this code in the functions.php of your child theme. And then you need to activate the display of your new filter in the schedule builder