Custom fields in Description for different item

Hi,

I have created custom fields for “student name” in invoice template. It works fine if only 1 items with 1 description.
how to differentiate the item so the name won’t display in the next item.
for example:
item 1 - night class - student id 123, student id 345
item 2 - day class - student id 099, student id 678
item 3 - full time class - student id 663, student id 990

I have edited the blue template like this:

                <?php
                $linecounter = 0;
                foreach ($items as $item) { ?>
                    <tr class="border-bottom-n <?php echo ($linecounter % 2 ? 'background-l' : '')?>">
                        <td><?php echo $item->item_name; ?></td>
                        <td><?php echo nl2br($item->item_description); ?>                           
                        <br><?php echo ($invoice->invoice_custom_participant1); ?> </br>
                        <br><?php echo ($invoice->invoice_custom_participant2); ?> </br>
		    <br><?php echo ($invoice->invoice_custom_participant3); ?> </br>		
		    <br><?php echo ($invoice->invoice_custom_participant4); ?> </br>
                        <br><?php echo ($invoice->invoice_custom_participant5); ?> </br>
                        </td>
                        <td class="text-right">
                            <?php echo format_amount($item->item_quantity); ?>
                        </td>
                        <td class="text-right">
                            <?php echo format_currency($item->item_price); ?>
                        </td>
                        <td class="text-right">
                            <?php echo format_currency($item->item_subtotal); ?>
                        </td>
                    </tr>
                    <?php $linecounter++; ?>
                <?php } ?>

            </tbody>
        </table>
        <table>

thanks in advance.

<?php echo lang('item'); ?> <?php echo lang('description'); ?> <?php echo lang('qty'); ?> <?php echo lang('price'); ?> <?php echo lang('total'); ?>

[size=10]Last Update: 25.01.2016[/size]