removing subtotal line in E-Mails

You can override the email template files to your theme folder.

Then remove this line of codes:

<tfoot>
	<?php
		if ( $totals = $order->get_order_item_totals() ) {
			$i = 0;
			foreach ( $totals as $total ) {
				$i++;
				?><tr>
					<th scope="row" colspan="2" style="text-align:left; border: 1px solid #eee; <?php if ( $i == 1 ) echo 'border-top-width: 4px;'; ?>"><?php echo $total['label']; ?></th>
					<td style="text-align:left; border: 1px solid #eee; <?php if ( $i == 1 ) echo 'border-top-width: 4px;'; ?>"><?php echo $total['value']; ?></td>
				</tr><?php
			}
		}
	?>
</tfoot>

That codes resides in:

* emails/admin-cancelled-order.php
* emails/admin-new-order.php
* emails/customer-completed-order.php
* emails/customer-invoice.php
* emails/customer-note.php
* emails/customer-processing-order.php

I hope it helps.

Try this

if ( $totals = $order->get_order_item_totals() ) {
	$i = 0;
	foreach ( $totals as $total ) {
		$i++;

		if( $total['label'] != 'Subtotal:') :

		?><tr>
			<th scope="row" colspan="2" style="text-align:left; border: 1px solid #eee; <?php if ( $i == 1 ) echo 'border-top-width: 4px;'; ?>"><?php echo $total['label']; ?></th>
			<td style="text-align:left; border: 1px solid #eee; <?php if ( $i == 1 ) echo 'border-top-width: 4px;'; ?>"><?php echo $total['value']; ?></td>
		</tr><?php

		endif;

	}
}

Let me know how it works for you.

I have tested on my end. It works. See this new order email notification screenshot.

Here is full codes of admin-new-order.php

<?php
/**
 * Admin new order email
 *
 * @author WooThemes
 * @package WooCommerce/Templates/Emails/HTML
 * @version 2.0.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}

?>

<?php do_action( 'woocommerce_email_header', $email_heading ); ?>

<p><?php printf( __( 'You have received an order from %s. The order is as follows:', 'woocommerce' ), $order->billing_first_name . ' ' . $order->billing_last_name ); ?></p>

<?php do_action( 'woocommerce_email_before_order_table', $order, true, false ); ?>

<h2><a href="<?php echo admin_url( 'post.php?post=' . $order->id . '&action=edit' ); ?>"><?php printf( __( 'Order #%s', 'woocommerce'), $order->get_order_number() ); ?></a> (<?php printf( '<time datetime="%s">%s</time>', date_i18n( 'c', strtotime( $order->order_date ) ), date_i18n( wc_date_format(), strtotime( $order->order_date ) ) ); ?>)</h2>

<table cellspacing="0" cellpadding="6" style="width: 100%; border: 1px solid #eee;" border="1" bordercolor="#eee">
	<thead>
		<tr>
			<th scope="col" style="text-align:left; border: 1px solid #eee;"><?php _e( 'Product', 'woocommerce' ); ?></th>
			<th scope="col" style="text-align:left; border: 1px solid #eee;"><?php _e( 'Quantity', 'woocommerce' ); ?></th>
			<th scope="col" style="text-align:left; border: 1px solid #eee;"><?php _e( 'Price', 'woocommerce' ); ?></th>
		</tr>
	</thead>
	<tbody>
		<?php echo $order->email_order_items_table( false, true ); ?>
	</tbody>
	<tfoot>
		<?php
			if ( $totals = $order->get_order_item_totals() ) {
				$i = 0;
				foreach ( $totals as $total ) {
					$i++;

					if( $total['label'] != 'Subtotal:') :

					?><tr>
						<th scope="row" colspan="2" style="text-align:left; border: 1px solid #eee; <?php if ( $i == 1 ) echo 'border-top-width: 4px;'; ?>"><?php echo $total['label']; ?></th>
						<td style="text-align:left; border: 1px solid #eee; <?php if ( $i == 1 ) echo 'border-top-width: 4px;'; ?>"><?php echo $total['value']; ?></td>
					</tr>

					<?php

					endif;
				}
			}
		?>
	</tfoot>
</table>

<?php do_action( 'woocommerce_email_after_order_table', $order, true, false ); ?>

<?php do_action( 'woocommerce_email_order_meta', $order, true, false ); ?>

<?php do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_text ); ?>

<?php do_action( 'woocommerce_email_footer' ); ?>

“I replaced the relevant part with the one you sent. Did I do wrong?”

Can you post your full codes? So I can have a look.

i need to remove payment method line from emails 🙁