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https://help.tallysolutions.com/docs/te9rel51/Voucher_Entry/Order_Processing/Alter_Delete_Sales_Order.htm

Altering and Deleting a Sales Order

To alter a Sales Order,

Go to Gateway of Tally > Display > Day Book

Or

Go to Gateway of Tally > Display > Inventory Books > Sales Orders Book

Make the necessary alterations and save.

Deleting a Sales Order

To delete a Sales order, press Alt + D in the Sales Order alteration screen.