Here this report the category name are repeating But I want to show category name once and its product. How can I do that please help.

xml version="1.0" encoding="utf-8"?>
<odoo>
    <data>

        
        <template id="item_template_id">
            <t t-if="o and 'company_id' in o">
                <t t-set="company" t-value="o.company_id">t>
            t>
            <t t-if="not o or not 'company_id' in o">
                <t t-set="company" t-value="res_company">t>
            t>
            <div class="header">
                <div class="row">
                    <div class="col-md-12 justify-content-center">
                        <center>
                            <b>
                                <h3 style="font-family: 'Helvetica';" t-field="company.name"/>
                                <h4>Item Wise Sales Reporth4>
                                <b>
                                    <span t-esc="data['start_date']"/>
                                b>
                                To
                                <b>
                                    <span t-esc="data['end_date']"/>
                                b>
                            b>
                        center>
                    div>
                div>
            div>
            <t t-call="web.html_container">
                <t t-call="web.external_layout">

                    
                    <style>
                        .table {
                        border: 1px solid black;
                        }

                        .table th{
                        font-family: 'Helvetica';
                        font-size: 18px;
                        border:1px solid black;
                        }

                        .table td{
                        font-family: 'Helvetica';
                        font-size: 18px;
                        border-left:1px solid black;
                        border-right:1px solid black;
                        }
                    style>
                    

                    
                    <div class="page">
                        
                        <table class="table">
                                <tr>
                                    <th>
                                        Product Category with Item Name
                                    th>
                                    <th>
                                        Qty
                                    th>
                                    <th>
                                        Unit
                                    th>
                                    <th>
                                        Net Sale
                                    th>
                                tr>
                            <t t-set="total_sale" t-value="0"/>
                            <t t-set="grand_sale" t-value="0"/>

                                <t t-foreach="invoice_line_items" t-as="invoice_line_item">
                                    <tr>
                                        <td>
                                            <div>
                                                <u>
                                                    <b>
                                                        <span t-esc="invoice_line_item['product_category_item']"/>
                                                    b>
                                                u>

                                            div>
                                        td>
                                        <td style="font-family: 'Helvetica';font-size: 18px;border-left:1px solid black;border-right:1px solid black;">td>
                                        <td style="font-family: 'Helvetica';font-size: 18px;border-left:1px solid black;border-right:1px solid black;">td>
                                        <td style="font-family: 'Helvetica';font-size: 18px;border-left:1px solid black;border-right:1px solid black;">td>
                                    tr>

                                    <t t-if="request.env['product.category'].search([('name', '=', invoice_line_item['product_category_item'])])">
                                    <tr>
                                        <td>
                                            <span t-esc="invoice_line_item['product_name']"/>
                                        td>
                                        <td style="text-align: right;">
                                            <t t-esc="invoice_line_item['quantity']"/>
                                        td>

                                        <td style="text-align: right;">
                                            <t t-esc="invoice_line_item['uom']"/>
                                        td>

                                        <td style="text-align: right;">
                                            <t t-esc="'{:,.2f}'.format(invoice_line_item['net_sale'])"/>
                                            <t t-set="total_sale" t-value="total_sale + invoice_line_item['net_sale']"/>
                                        td>
                                    tr>
                                    <tr>
                                        <td style="text-align: right;">
                                            <b>Category Totalb>
                                        td>
                                        <td>td>
                                        <td>td>
                                        <td style="border-top:1px solid black;text-align: right;">
                                            <b>
                                                <span t-esc="'{:,.2f}'.format(total_sale)"/>
                                            b>
                                        td>
                                    tr>
                                t>
                            t>

                            <tr>
                                <td style="text-align: left;">
                                    <b>Grand Totalb>
                                td>
                                <td>td>
                                <td>td>
                                <td style="border-top:1px solid black;text-align: right;">
                                    <u>
                                        <b>
                                            <t t-set="grand_sale" t-value="grand_sale + total_sale"/>
                                            <span t-esc="'{:,.2f}'.format(grand_sale)"/>
                                        b>
                                    u>
                                td>
                            tr>

                            
                            
                            <div class="footer" style="text-align: right;margin-top: 2px;">
                                <span class="page"/>
                            div>
                            
                        table>
                    div>
                t>
            t>
        template>

    data>
odoo>