Thanks for pointing me in the right direction. I found a different solution. In customCart.php

function sc_addShipping($cartItems) {
	$shippingTotal = 0;
	foreach ($cartItems as $cartItem) {
		$shippingTotal += @$cartItem['shipping'] * @$cartItem['quantity'];
		foreach ($cartItem['OPTIONS'] as $option) {
			$shippingTotal += @$option['shipping'] * @$cartItem['quantity'];
		}
	}
	return array( 'name' => 'Shipping', 'TOTAL' => $shippingTotal );
}

Changed:

return array( 'name' => 'Shipping', 'TOTAL' => $shippingTotal );

to

return array( 'name' => 'Delivery', 'TOTAL' => $shippingTotal );

Using the same method I changed TAX to VAT.

function sc_addTax($cartItems) {…

return array( 'name' => "VAT ($taxPercentage%)", 'TOTAL' => $taxTotal );

…}

It looks like $extraLineItems is an array of fieldnames to arrays.  So name is defined in $extraLineItems.

I'm not familiar with that exact piece of code but if you want to override output for a single value you can do it like this

<p class="mb-0">
<?php 
if ($extraLineItem['name'] === 'previous value') { 
  echo "new value"; 
}
else { 
 echo htmlencode($extraLineItem['name']);
}
?>
</p>

Or you can use the new match expression in PHP 8.0+ which can be simpler than long if/if else/else statements:

<p class="mb-0">
<?php
echo match ($extraLineItem['name']) {
    'old value 1'   => 'new value 1',
    'another value' => 'new value 2',
    default         => htmlencode($extraLineItem['name']),
};
?>
</p>

Hope that helps!

Can it be easily changed without screwing-up anything else? Thanks!

<?php if ($extraLineItems): ?>
<?php foreach ($extraLineItems as $extraLineField => $extraLineItem): ?>
<div class="row">
<div class="col-6">
<p class="mb-0"><?php echo htmlencode($extraLineItem['name']); ?></p>
</div>
<div class="col-6">
<p class="text-end mb-0"><?php echo sc_moneyFormat($extraLineItem['TOTAL']); ?></p>
</div>
</div>
<?php endforeach; ?>
<?php endif; ?>