[cflsystems]

{foreach from=$extra_fields item=v}
  {if $v.active eq "Y" && $v.field_value && $v.service_name eq "xxx"}
    <tr>
     <td class="property-name">{$v.field}</td>
     <td class="property-value">{$v.field_value}</td>
    </tr>
  {/if}
{/foreach}
 

replace "xxx" with the service name for the field