woocommerce_cart_item_price.php

<?php
/**
 * Return a blank instead of the product for products that contain child products
 */
function my_prefix_cart_item_price( $price, $cart_item, $cart_item_key ) {
	$product_id = $cart_item['data']->get_id();
	// Add the product IDs here that contain child products
	if( in_array( $product_id, array( 5121, 2222 ) ) ) {
		// You can enter different text below if you wish
		return '-';
	}
	return $price;
}
add_filter( 'woocommerce_cart_item_price', 'my_prefix_cart_item_price', 10, 3 );

function my_prefix_cart_item_subtotal( $subtotal, $cart_item, $cart_item_key ) {
	$product_id = $cart_item['data']->get_id();
	// Add the product IDs here that contain child products
	if( in_array( $product_id, array( 5121, 2222 ) ) ) {
		// You can enter different text below if you wish
		return '-';
	}
	$subtotal;
}
add_filter( 'woocommerce_cart_item_subtotal', 'my_prefix_cart_item_subtotal', 10, 3 );