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<?php

// place this in your theme functions.php file

function my_custom_pos_tabs($params){
  $params['tabs'] = array(
    'all' => array(
      'label' => __( 'All', 'woocommerce'),
      'active' => true
    ),
    'music' => array(
      'label' => 'Music',
      'id' => 'cat:music'
    ),
    'posters' => array(
      'label' => 'Posters',
      'id' => 'cat:posters'
    )
  );
 
  return $params;
}
add_filter('woocommerce_pos_params', 'my_custom_pos_tabs');