Hello,
I think you can either try the following snippet or use this premium extension https://woocommerce.com/products/woocommerce-checkout-field-editor/
add_filter( 'woocommerce_checkout_fields' , 'custom_override_checkout_fields' );
function custom_override_checkout_fields( $fields ) {
unset($fields['billing']['billing_first_name']);
unset($fields['billing']['billing_last_name']);
unset($fields['billing']['billing_company']);
unset($fields['billing']['billing_address_1']);
unset($fields['billing']['billing_address_2']);
unset($fields['billing']['billing_city']);
unset($fields['billing']['billing_postcode']);
unset($fields['billing']['billing_country']);
unset($fields['billing']['billing_state']);
unset($fields['billing']['billing_phone']);
unset($fields['order']['order_comments']);
unset($fields['billing']['billing_address_2']);
unset($fields['billing']['billing_postcode']);
unset($fields['billing']['billing_company']);
unset($fields['billing']['billing_email']);
unset($fields['billing']['billing_city']);
return $fields;
}
(From https://gist.github.com/jgalea/5884548)