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<?php

// Remove some fields from billing form
// Our hooked in function - $fields is passed via the filter!
// Get all the fields - https://docs.woothemes.com/document/tutorial-customising-checkout-fields-using-actions-and-filters/
function custom_override_checkout_fields_ek( $fields ) {
     unset($fields['billing']['billing_company']);
     unset($fields['billing']['billing_address_1']);
     unset($fields['billing']['billing_postcode']);
     unset($fields['billing']['billing_state']);

     return $fields;
}
add_filter( 'woocommerce_checkout_fields' , 'custom_override_checkout_fields_ek', 99 );

<?php
//remove some fields from billing form
//ref - https://docs.woothemes.com/document/tutorial-customising-checkout-fields-using-actions-and-filters/
function wpb_custom_billing_fields( $fields = array() ) {

	unset($fields['billing_company']);
	unset($fields['billing_address_1']);
	unset($fields['billing_address_2']);
	unset($fields['billing_state']);
	unset($fields['billing_city']);
	unset($fields['billing_phone']);
	unset($fields['billing_postcode']);
	unset($fields['billing_country']);

	return $fields;
}
add_filter('woocommerce_billing_fields','wpb_custom_billing_fields');