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https://help.tallysolutions.com/docs/te9rel53/Voucher_Entry/Order_Processing/Enabling_Order_Processing.htm

Enabling Order Processing

To enable Purchase Order, Sales Order and Job Order Processing in Tally.ERP 9, activate the following in F11: Features (F2: Inventory Features)

Set Enable purchase order processing, Allow Sales Order Processing, and Enable job order processing to Yes in the Order Processing section.

Note: When Enable job order processing is set to Yes, the options Maintain multiple Godowns and Use material in and out vouchers get enabled automatically.