Sečtení stejných sazeb DPH v tabulce DPH na faktuře

[menace]

Dobrý den,

potřeboval bych sečíst dohromady stejné sazby daně v tabulce rozpisu DPH na faktuře. Když mám výrobky s 21% DPH a dopravu s 21% DPH, tak mi vyskakují v rozpisu DPH zvlášť. Chci ulehčit práci účetní. V invoice.tpl jsem si našel tento kód, ale nejsem schopný přijít na to, jak ty dvě proměnné sečíst:

 

Díky za radu.

   <!--  TAX DETAILS -->
                <table style="width: 100%;">
                    <tr>


                        <td style="width: 48%;">
                            {if $tax_exempt}
                            {l s='Exempt of VAT according section 259B of the General Tax Code.' pdf='true'}
                            {else if (count($shipping_tax_breakdown) + count($product_tax_breakdown) == 0)}
                            
                            {else}
                            <table style="width: 100%;" >
                                <tr style="line-height:6px;border-bottom:0px solid black;">
                                    <td style="width: 2%;text-align: left;"></td>
                                    <td style="border-bottom:0px solid black;text-align: left; background-color: white; color: black;  font-weight: bold; width: 25%">{l s='Tax Detail' pdf='true'}</td>
                                    <td style="border-bottom:0px solid black;text-align: center;background-color: white; color: black;font-weight: bold; width: 20%">{l s='Tax Rate' pdf='true'}</td>
                                    {if !$use_one_after_another_method}
                                    <td style="border-bottom:0px solid black;text-align: center; background-color: white; color: black; font-weight: bold; width: 28%">{l s='Total Tax Excl' pdf='true'}</td>
                                    {/if}
                                    <td style="border-bottom:0px solid black;text-align: center;background-color: white; color: black;  font-weight: bold; width: 25%">{l s='Total Tax' pdf='true'}</td>
                                </tr>
<div style="line-height: 0.1pt"> </div>
                                {if isset($product_tax_breakdown)}
                                {foreach $product_tax_breakdown as $rate => $product_tax_infos}
                                <tr style="line-height:6px;background-color:white;">
                                     <td style="border-left:0px solid black;width: 2%;text-align: left;"></td>
                                    <td style="width: 28%;text-align: left;">{l s='Products' pdf='true'}</td>
                                    <td style="width: 20%; text-align: center;">{$rate|number_format:0} %</td>
                                    {if !$use_one_after_another_method}
                                    <td style="width: 25%; text-align: center;">
                                        {if isset($is_order_slip) && $is_order_slip} {/if}{displayPrice currency=$order->id_currency price=$product_tax_infos.total_price_tax_excl}
                                    </td>
                                    {/if}
                                    <td style="width: 23%; text-align: center;">{if isset($is_order_slip) && $is_order_slip} {/if}{displayPrice currency=$order->id_currency price=$product_tax_infos.total_amount}</td>
                                 <td style="width: 2%;text-align: right;"></td>
                                </tr>
                                {/foreach}
                                {/if}

                                {if isset($shipping_tax_breakdown)}
                                {foreach $shipping_tax_breakdown as $shipping_tax_infos}
                                <tr style="line-height:6px;background-color:{cycle values='#FFF,#FFF'};">
                                    <td style="border-left:0px solid black;width: 2%;text-align: left;"></td>
                                    <td style="width: 28%;text-align: left;">{l s='Shipping' pdf='true'}</td>
                                    <td style="width: 20%; text-align: center;">{$shipping_tax_infos.rate|number_format:0} %</td>
                                    {if !$use_one_after_another_method}
                                    <td style="width: 25%; text-align: center;">{if isset($is_order_slip) && $is_order_slip} {/if}{displayPrice currency=$order->id_currency price=$shipping_tax_infos.total_tax_excl}</td>
                                    {/if}
                                    <td style="width: 23%; text-align: center;">{if isset($is_order_slip) && $is_order_slip} {/if}{displayPrice currency=$order->id_currency price=$shipping_tax_infos.total_amount}</td>
                                  <td style="width: 2%;text-align: left;"></td>
                                </tr>
                                {/foreach}
                                {/if}