I did it in the Purchase report with no problem at all ..

But I need to do it in Sales/Quotation Report .. in here I am facing problem ..

I made a Screenshot please check what I am doing wrong?

https://watch.screencastify.com/v/0sbUfwHfXCfxJCVbH1Kn

I made the same thing with Quotation report "Blank" and I drag and drop the Subtotal $ Total into the page same as you made .. but an error comes:

Error when compiling AST
<pre>&#039;sale.order&#039; object has no attribute &#039;amount_by_group&#039; Traceback (most recent call last): File &quot;/home/odoo/src/odoo/15.0/odoo/addons/base/models/qweb.py&quot;, line 219, in render_template yield from compiled_fn(self, values, log) File &quot;&lt;template_4335&gt;&quot;, line 119, in template_4335 AttributeError: &#039;sale.order&#039; object has no attribute &#039;amount_by_group&#039; Error when render the template AttributeError: &#039;sale.order&#039; object has no attribute &#039;amount_by_group&#039; Template: studio_customization.studio_report_docume_c1b89cd0-6d5d-4c3c-9b52-285734812c30_document Path: /t/div/div/div[2]/table/t[4] Node: &lt;t t-set=&quot;total_amount_by_groups&quot; t-value=&quot;doc.amount_by_group&quot; data-oe-id=&quot;4335&quot; data-oe-xpath=&quot;/t/div/div/div[2]/table/t[4]&quot;/&gt; </pre>

Thanks .. waiting for your reply.

the issue is with amount_by_group - if you have sales orders with sections it will cause this issue. Investigating more ....