I have the stock batch transfer report (stock_picking_batch.report_picking_batch)
<?xml version="1.0"?>
<t t-name="stock_picking_batch.report_picking_batch">
<t t-call="web.html_container">
<t t-foreach="docs" t-as="o">
<t t-set="move_line_ids" t-value="o.picking_ids.mapped('move_line_ids')"/>
<t t-set="has_package" t-value="move_line_ids.filtered('result_package_id')" groups="stock.group_tracking_lot"/>
<t t-set="has_serial_number" t-value="move_line_ids.filtered('lot_id')" groups="stock.group_production_lot"/>
<t t-set="has_barcode" t-value="move_line_ids.mapped('product_id').filtered('barcode')"/>
<t t-set="locations" t-value="move_line_ids.mapped('location_id')"/>
<t t-call="web.external_layout">
<div class="page">
<h3>Summary: <span t-field="o.name"/>
</h3>
<div t-if="o.user_id">
<strong>Responsible:</strong>
<span t-field="o.user_id"/>
</div>
<br/>
<table class="table table-condensed">
<thead>
<tr>
<th>Picking Reference</th>
<th>Barcode</th>
<th>Status</th>
<th>Scheduled Date</th>
</tr>
</thead>
<tbody>
<tr t-foreach="o.picking_ids" t-as="pick">
<td>
<span t-field="pick.name"/>
</td>
<td>
<img t-att-src="'/report/barcode/?type=%s&value=%s&width=%s&height=%s&quiet=%s' % ('Code128', pick.name, 400, 100, 0)" style="width:200px;height:50px" alt="Barcode"/>
</td>
<td>
<span t-field="pick.state"/>
</td>
<td>
<span t-field="pick.scheduled_date"/>
</td>
</tr>
</tbody>
</table>
<p style="page-break-after: always;"/>
<t t-foreach="locations" t-as="location">
<t t-set="loc_move_line" t-value="move_line_ids.filtered(lambda x: x.location_id==location)"/>
<t t-set="products" t-value="loc_move_line.mapped('product_id')"/>
<h3>
<span t-field="o.name"/>
</h3>
<div t-if="o.user_id">
<strong>Responsible:</strong>
<span t-field="o.user_id"/>
</div>
<br/>
<h4>
<strong>To take from: <span t-field="location.display_name"/>
</strong>
</h4>
<table class="table table-condensed">
<thead>
<tr>
<th>Product</th>
<th>Quantity</th>
<th width="27%">To</th>
<th width="23%">Picking</th>
<th t-if="has_serial_number" width="15%">
<strong>Lot/Serial Number</strong>
</th>
<th t-if="has_barcode" width="15%" class="text-center">
<strong>Product Barcode</strong>
</th>
<th t-if="has_package" width="15%">
<strong>Package</strong>
</th>
</tr>
</thead>
<tbody>
<tr t-foreach="loc_move_line" t-as="move_operation">
<td>
<span t-field="move_operation.display_name"/>
</td>
<td>
<t t-if="not has_package">
<t t-if="any(move_operation.filtered(lambda l: l.state == 'done'))">
<span t-esc="sum(move_operation.mapped('qty_done'))"/>
</t>
<t t-else="">
<span t-esc="sum(move_operation.mapped('product_uom_qty'))"/>
</t>
</t>
<t t-if="has_package">
<span t-esc="sum(move_operation.mapped('qty_done'))"/>
</t>
<span t-field="move_operation.uom_id" groups="move_operation.group_uom"/>
</td>
<td>
<span t-esc="move_operation.mapped('location_dest_id').display_name"/>
</td>
<td>
<span t-esc="move_operation.mapped('picking_id').display_name"/>
</td>
<td t-if="has_serial_number and (move_operation.lot_id or move_operation.lot_name)" class="text-center h6" width="15%">
<img t-att-src="'/report/barcode/?type=%s&value=%s&width=%s&height=%s&humanreadable=1' % ('Code128', move_operation.lot_id.name, 600, 100)" style="width:100%;height:35px;" alt="Barcode"/>
</td>
<td width="15%" class="text-center" t-if="has_barcode">
<span t-if="move_operation.product_id and move_operation.product_id.barcode">
<img t-if="len(move_operation.product_id.barcode) == 13" t-att-src="'/report/barcode/?type=%s&value=%s&width=%s&height=%s' % ('EAN13', move_operation.product_id.barcode, 600, 100)" style="width:100%;height:35px" alt="Barcode"/>
<img t-elif="len(move_operation.product_id.barcode) == 8" t-att-src="'/report/barcode/?type=%s&value=%s&width=%s&height=%s' % ('EAN8', move_operation.product_id.barcode, 600, 100)" style="width:100%;height:35px" alt="Barcode"/>
<img t-else="" t-att-src="'/report/barcode/?type=%s&value=%s&width=%s&height=%s' % ('Code128', move_operation.product_id.barcode, 600, 100)" style="width:100%;height:35px" alt="Barcode"/>
</span>
</td>
<td t-if="has_package" width="15%">
<span t-field="move_operation.package_id"/>
<t t-if="move_operation.result_package_id">
→ <span t-field="move_operation.result_package_id"/>
</t>
</td>
</tr>
</tbody>
<table class="table table-condensed">
<thead>
<tr>
<th>Subtotals</th>
</tr>
</thead>
<tbody>
</tbody>
</table>
</table>
<p style="page-break-after: always;"/>
</t>
</div>
</t>
</t>
</t>
</t>I want to be able to add lines below under product totals if they are in the same location, I am not sure what is the best way to go about this? I tried to use some examples online but most are from v10 and Odoo has changed since that time. I have the information I need on the report but need to be able to add and group them.
So say we need
3 of product x in location a
4 of product x in location a
1 of product x in location b
subtotals
7 of product x in location a
1 of profuct x in location b 
