In our setup , there is no request for quotation , rather we order over phone and get the product with bill. currently we enter the purchase bill in quotation and validate it.
I want to implement a way to enter the purchase bill value before my staffs start entering the individual items in that bill.
this way they dont miss any items or even mistakenly enter wrong values. If the bill value is provided at the start , it should match the final total bill value once they enter all the items and GST values etc.
How can i accomplish this ? Is there any add-on to get this work done ?