I have configurable list widget and required calculation of total quant

I have configurable list widget and required calculation of total quantities in the rows entered

I check all replies and no one said its possible by the configurable widget is there is any other widget can offer same calculations or if JotForm they can provide a specialist to do it for me I don't have any problem to charge me for that

You can use an input table on your form and use calculation as required: https://www.jotform.com/help/343-how-to-perform-form-calculation-in-the-input-table-field

Do try this and let us know if you can work out with the input table. If not please let us know and also provide us the form URL so that we could help you out.