To Delete a Customer in QuickBooks, start by opening the software and navigating to the “Customers” menu. Select “Customer Center” to view your list of customers. Locate the customer you wish to delete and right-click on their name. Choose the “Delete Customer:Job” option from the dropdown menu. Confirm the deletion when prompted. Note that deleting a customer removes all associated transactions, so ensure this action is necessary. For safety, consider making a backup of your data before proceeding. If you cannot delete a customer, you might need to make them inactive instead, preserving historical data.