Code to delete products from the site - By WebToffee( Product Import and Export plugin)

functions.php

<?php //Do not copy this line of code
function wt_ier_delete_existing_product_in_certain_category($query_args)
{
	$query_args['tax_query'][] = array(
		'taxonomy' => 'product_cat',
		'field' => 'slug',
		'terms' => array('category1', 'category2', 'category3')
	);
	
	return $query_args;
}

add_filter('wt_ier_product_importer_pre_delete_existing_query_args', 'wt_ier_delete_existing_product_in_certain_category', 11);