Using this filter you can easily add any custom meta option in the Application post type. Here is a sample code that how you can do that.
if( ! function_exists('extra_application_meta_options') ) {
function extra_application_meta_options($options) {
$options['My Tab'] = array(
'job_bm_am_my_key'=>array(
'css_class'=>'am_my_key',
'title'=>__('My Custom Key', job_bm_am_textdomain),
'option_details'=>'Description of My Custom key',
'input_type'=>'text', // text, radio, checkbox, select,
'input_values'=>'', // could be array
),
);
return $options;
}
}
add_filter('job_bm_filters_application_meta_options', 'extra_application_meta_options', 30, 1);
Here is also an output for using this filter

