Use Product Quantities to let customers change how many units of an existing line item they ordered. The quantity control covers increases, decreases, and removal; the Order Downgrading settings on the same page determine whether value-reducing changes can be completed and how the refund is issued.
Confirm your inventory locations can supply added units.
Decide whether customers may reduce or remove quantities as well as increase them.
If reductions are allowed, choose a partial-refund method.
Test bundle line items separately because their editability also depends on your bundle configuration.
In Order Editing, open App Settings.
Select Editing blocks.
Open Product Quantities.
Turn on Allow customers to edit the quantity of their order.
If customers may reduce or remove quantities, turn on Allow customers to downgrade their order.
Choose a downgrade refund method.
Save the changes.
Control | What it allows |
|---|---|
Allow customers to edit the quantity of their order | Shows the customer quantity controls for eligible line items. Customers can increase, decrease, or remove quantities when the related order outcome is also allowed. |
Allow customers to downgrade their order | Allows an edit that lowers the order total, including a quantity decrease, item removal, cheaper product change, or post-purchase discount code. |
If you want to prevent customers from changing quantities but still allow cheaper product changes or discount codes, keep downgrades on and turn quantity editing off. Turning downgrades off affects all edits that need a partial refund, not just quantity removals.
Refund method | Customer outcome | Limitation |
|---|---|---|
Payment Method Refund | The partial refund returns to the original payment method or the gift card used for the order. | Processing and settlement timing are controlled by Shopify, the gateway, and the payment provider. |
Store Credit Refund | The customer receives Shopify store credit in the order's localized currency. | Requires the store-credit permission and captured payment. It is unavailable while manual payment capture is enabled. |
When downgrades are enabled without a refund selection, the page asks you to choose one. New setups default to payment-method refunds when downgrades are first enabled without an existing method, but you should still confirm the displayed selection.
Increasing a quantity checks availability and can require the customer to pay the added amount.
Decreasing a quantity or removing the line item requires downgrades and produces a partial refund using the selected method.
A same-total change does not need an added payment or partial refund, but other product, bundle, inventory, or order restrictions can still apply.
The final change updates the existing Shopify order. The payment step is not guaranteed to be literally one click: the customer follows the payment or authorization experience available for that order and placement.
Use the translation action on Product Quantity Editing to customize the customer-facing section, quantity, save, remove, bundle, status, and loading text for supported languages. Keep the removal wording consistent with your downgrade and refund policy.
Open an existing eligible order containing a stocked product with a quantity greater than one.
Open the order during the editing window.
Increase the quantity and complete any additional payment.
Confirm the existing Shopify order and inventory reflect the increase.
If downgrades are enabled, decrease the quantity and confirm the partial refund uses the selected method.
Remove a line item and confirm the resulting order total, discounts, taxes, and refund.
Reuse the same order to check a sold-out item and, if applicable, a bundle item where the order contents allow it.
Confirm quantity editing is enabled and the order is still eligible for editing.
For decreases or removals, confirm downgrades and a refund method are enabled.
For store credit, confirm the required permission is granted, payment is captured, and manual capture is off.
Confirm sufficient inventory exists for an increase under the current inventory settings.
Check whether the item is part of a bundle whose editing preference blocks the change.
Review payment, discount, tax, and fulfilment restrictions on the order.
