Let me give you a way to do this. From the sales cart table let's add a column item tax type as header. And within it. Let's put a checkbox. The checkbox should be checked by default ( mark of item tax type selected). If we uncheck it. The item tax should be exempted. Here the functionality is complex. We have to pass this checkbox value to tax calculations and modify it.
But there is one thing I am not sure to bring. After we created the invoice, order or quote. As we are calling the tax calculations again to get it. Like on sales order view page we call the tax calculations again and get the values. In this case, we need to create a column in debtors_trans_details and sales_order_details.
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