Change price or cost during sale or purchase - SalePro Pos and Inventory Management System

change price or cost during sale or purchase in SalePro - Inventory Management System with POS, HRM, Accounting
Demo Link-
salepropos.com/
Download Link-
codecanyon.net...
Developer Website-
lion-coders.com/
SalePro POS - Ultimate Inventory Management Software with POS (Point of Sale) is an open source php script. Based on latest laravel framework, this stock/inventory management software allows you to manage your inventory, sales, purchases, customers, invoices, payments, employees, accounting and much more.
Update your stock information, make purchases and view sales information from anywhere anytime. Whether you are running a small business or a big enterprise - SalePro POS is the solution you need.

[@mohamed24566]

I bought this product from you, but how do I change the final invoice design