Hello, my client wants the total tax to be displayed after "Extended total line" like in the image attached to this post. Is it possible to take tax variable from "extended total line", create new line and put the variable there? Could you please tell me which files to modify?

Hello. File you must edit is administrator/components/com_vminvoice/helpers/invoicehelper.php

Around line 1291 place something like this:

$vatLine = $template[1];
$vatLine = InvoiceHelper::removeColumns($vatLine,$colsToDelete);
if ($leftOffset>0 && $labelColspan>0){ //make column wider straight to subtotal
$vatLine = InvoiceHelper::removeColumns($vatLine,range($leftOffset-1, $subtotalOffset -1));
$td = '<td align="left" colspan="'.$labelColspan.'">'.JText::_('Vat total').':</td>';
$vatLine = InvoiceHelper::addColumn($vatLine,$leftOffset-1, $td);
}

$totalTax = $this->subtotal_tax + $couponTaxAmount;

$vatLine = str_replace('{subtotal}',InvoiceCurrencyDisplay::getFullValue($totalTax, $this->currency),$vatLine);
$vatLine = preg_replace('#\{[\w ]+\}#Us','',$vatLine); //remove rest of tags

Then find line cca 1393 and after

$code.= VMI_NL.InvoiceHelper::setColumnWidths($totalLine,$colWidths);

place

$code.= VMI_NL.InvoiceHelper::setColumnWidths($vatLine,$colWidths);

Also turn off "Extended Total Line" in Invoce Items Configuration.

Note after each component update you will have to probably edit code again, because file is rewrited.
Another solution would be paid customization (1 hour), which will make this option permanent.
Regards.

Thanks a lot, worked just fine. I edited invoicehtml.php not invoicehelper.php