Aggregate line item based on tax rate in Advanced PDF template

Item line code for aggregating the items based on tax rate and adding the rate, gross amount, tax amount and quantity

<table class="itemtable" style="width: 100%; margin-top: 20px;border-bottom: 1.5px solid Silver;"><!-- start items -->
<thead>
	<tr>
	<th colspan="10">Description</th>
    <th colspan="5">Customer <br />Reference</th>
    <th colspan="5">Shipment<br />Reference</th>
    <th align="right" colspan="4">Amount</th>
	<th align="right" colspan="4"><p style="text-align: center;">Tax Rate</p></th>
	<th align="right" colspan="4">Tax Amount</th>
	<th align="right" colspan="4"><p style="text-align: center;">Total<br /> Amount</p></th>
	</tr>
</thead>
   <#assign seenstyle = []>
   <#list record.item as item>
     <#assign Quantity=0/>
     <#assign Rate=0/>
     <#assign Taxamount=0/>
     <#assign Grossamount=0/>
      <#assign groupid = item.taxrate1>
   <#if seenstyle?seq_contains(groupid)> <!-- no if body is intentional; skips seen style -->
   <#else>
     <#assign seenstyle = seenstyle + [groupid]/>
<#list record.item as item2>
<#if item.taxrate1==item2.taxrate1>
  <#assign Rate=(Rate+item2.amount)/>
  <#assign Quantity=(Quantity+item2.quantity)/>
  <#assign Taxamount=(Taxamount+item2.tax1amt)/>
  <#assign Grossamount=(Grossamount+item2.grossamt)/>
  </#if>
  </#list>

  <#if groupid?has_content>
    <tr>
	<td colspan="10"><span class="itemname">${item.item}</span><br />${item.description}</td>
     <td  colspan="5">${item.custcol_mf_med_customref}</td>
     <td colspan="5">${item.custcol_mf_med_shipmentref}</td>
    <td align="right" colspan="4">${currency[record.currencysymbol]}${Rate?string["#,###.00"]}</td>
	<td align="right" colspan="4"><#if item.taxrate1?has_content>${item.taxrate1}<#else>0%</#if></td>
	<td align="right" colspan="4"><#if Taxamount?has_content>${currency[record.currencysymbol]}${Taxamount?string["#,###.00"]}<#else>${(item.taxrate1*Rate)?string["#,###.00"]}</#if></td>
	<td align="right" colspan="4"><#if Grossamount?has_content>${currency[record.currencysymbol]}${Grossamount?string["#,###.00"]}<#else>${((item.taxrate1*Rate)+Rate)?string["#,###.00"]}</#if></td>
	</tr>
     <#else>
   <tr>
	<td colspan="10" line-height="12px"><span class="itemname">${item.item}</span><br />${item.description}</td>
    <td colspan="5" line-height="12px">${item.custcol_mf_med_customref}</td>
    <td colspan="5" line-height="12px">${item.custcol_mf_med_shipmentref}</td>
    <td align="right" colspan="4" line-height="12px">${item.amount}</td>
	<td align="right" colspan="4" line-height="12px"><#if item.taxrate1?has_content>${item.taxrate1}<#else>0%</#if></td>
	<td align="right" colspan="4" line-height="12px"><#if item.tax1amt?has_content>${item.tax1amt}<#else>${(item.taxrate1*item.amount?string["#,###.00"])}</#if></td>
	<td align="right" colspan="4" line-height="12px"><#if item.grossamt?has_content>${item.grossamt}<#else>${((item.taxrate1*item.amount)+item.amount?string["#,###.00"])}</#if></td>
	</tr>
  </#if>
    </#if>
    </#list>
	<!-- end items --></table>
      <!--  <hr style="background-color:#d3d3d3;width:100%;border:1px;color: #d3d3d3;height:1px;"/>-->
</#if>