How do I update Inventory in Access

I have a form where the user enters the item purchased and the quantity - I want that quantity entered in the customer invoice to be deducted from the Quantity_On_Hand field in the Inventory table. What would be the best way to accomplish this? I assume I would need to enter an expression in the after update on the quantity in the customer invoice? What I have tried so far has accomplished nothing but errors

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Count Distinct in Access
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Private Sub CmdConfirm_Click()
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Something like "QtyOnHand = QtyOnHand - QtyUsed + QtyReceived"

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