Edit Existing Customer Group Price
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Go to Manage Item → select the item you want to update.

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Click on Manage Price under the item’s price column.

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In the popup window, switch to the Customer Group Pricing tab.

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Locate the customer group (e.g., STAFF).
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Update the existing Group Pricing value in the input box.

To delete the item from customer group pricing, check the delete checkbox.

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Click Confirm to save the changes.
