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https://quickbooktoolhub.com/how-to-merge-customers-in-quickbooks/
To consolidate customers in QuickBooks, begin by choosing "Sales" on the left menu, then "Customers." Select the customer to retain and update their information to be identical to the customer to consolidate. Name, address, and contact details are included. After matching, save. QuickBooks will prompt a confirmation query as to whether you wish to consolidate the customers. Click "Yes," and both profiles' data will merge into one customer record. This prevents duplicates and maintains financial records accurately.