To work with item substitution on a sales order, you have to create a custom sales order form.
To customize the sales order form for item substitution:
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Go to Transactions > Sales > Enter Sales Orders
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Click Customize at the top of the form and then select Customize Form.
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n the Name field, enter a name to identify the form.
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Click the Sublist Fields subtab.
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Under the Label column, locate Item Substitution and Original Item. Select the Show box for each.
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Click Save.