Import customers or vendors from email contacts to QuickBooks Online
https://quickbooks.intuit.com/learn-support/en-us/help-article/customer-list/import-customers-vendors-email-contacts-quickbooks/L12erg8Db_US_en_US
Check the contacts, fill in any missing information, and correct any mistakes. Make sure the file doesn't exceed the 2MB or 1000 row limit. If it does, split it into multiple import files. Import your contacts. Now that your spreadsheet is accurate, you're ready to import your contacts to QuickBooks Online. Sign in to QuickBooks. Select ...
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