Quickbooks Desktop - Import an IIF File

https://quickbooks.intuit.com/learn-support/en-ca/help-article/import-export-files/export-import-edit-iif-files/L56LT9Z0Q_CA_en_CA?uid=maefy591

Learn how to import and export Intuit Interchange Format (IIF) files to and from QuickBooks Desktop for Windows.

You can use IIF files to import and export your lists and transactions to and from QuickBooks Desktop. We'll show you how.

Tip: If you use QuickBooks Desktop 2019 and later, here’s how to import your lists and transactions with the improved IIF tool.