pre_get_post_tax_query.php

function exclude_sub_units($query) {

 

    

    if(!is_admin() || wp_doing_ajax() ) {



        if($query->get('post_type') == 'estate_property') {  



            $meta_query = $query->get('tax_query');         



            $meta_query[]= array(

                'relation' => 'AND',

                array(

                    'taxonomy' => 'subunits',

                    'field' => 'slug',

                    'terms' => 'subunit',

                    'operator' => 'NOT IN'

                )

            );



            $query->set( 'tax_query', $meta_query);

                

                //$query->set( 'post__not_in', array(19259,19500,19504) );



        }

    }



}





add_action( 'pre_get_posts', 'exclude_sub_units' );