It is not documented but I think you can put a percentage sign in the price field. So you could say 3.5% and Isotope will add that to the subtotal. I got it from the module...
Code:
$blnPercentage = substr($strPrice, -1) == '%' ? true : false;
if ($blnPercentage)
{
$fltSurcharge = (float)substr($strPrice, 0, -1);
$fltPrice = $this->Isotope->Cart->subTotal / 100 * $fltSurcharge;
}
else
{
$fltPrice = (float)$strPrice;
}
Or do you perhaps mean in the description? In that case I know no standard way, other then editing the templates...
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