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"Use Edit Log for transactions/masters, and digital signature for invoices/reports with Release 2.1. Download NOW!"
https://help.tallysolutions.com/docs/te9rel66/Reports/Display_Inventory_Reports/Intro_Sales_and_Purchase_Orders.htm

Sales and Purchase Orders

In Tally.ERP 9, various features of sales and purchase order such as sales order book, sales order summary, purchase order book, purchase order summary, sales and purchase bills pending details are supported.

To know more, click the links below:

Sales Order Book

Sales Order Summary

Purchase Order Book

Purchase Order Summary

Purchase Bills Pending

Sales Bills Pending