When you have accounts in Commit which are parallel to customers/vendors in QuickBooks, you should link between them prior to any import process. This is because linked records are updated while unlinked ones are created as new accounts in Commit, which may result in duplicate records.
To link a single Account record to the parallel record in QuickBooks, select the relevant Commit Account and then select the option 'Link Account to QuickBooks Customer/Job/Vendor Record' from the QuickBooks menu in the Accounts window.
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