Some changes in PHP script

I am looking for some modification of a ready script based on inventory and sales management. Here is the script [login to view URL] Changes I am looking is: Option to import sales in bulk @ [login to view URL] for multiple customers, currently you can see it can be done for only one customer. I want an option to choose particular customer from Customer box or choose an option to "create customer". If "create customer" option is chosen then the upload tempalte will be different which will have option to create customer name, address 1, address 2, city, pincode etc (whatever you are seeing the fields creating new customer), reference no. (if not filled than generated automatically by script which is already being generated now for creating new sales) and all the 7 options that you are seeing below "CSV File " ie, Attach Document (an url will be used which will import the document), Order Tax, Order Discount, Shipping, Sale Status , Payment Term, Payment Status * Above are the points I am looking to implement, lets go through the same and confirm and your quote please I will share FTP access wherein changes can be made. I have 6 more points to make changes..but first above has to be resolved. Please quote charges and confirm. thanks,