QB Issue Resolution:

What should work fine is to import all the transactions from Web Connect or Direct Connect. You see them in the Banking->Download Transactions Window. They are kind of “on deck” – not yet accepted into your register. You can choose which ones you want to delete or import there one by one.

Once you delete one you can’t get it back so be careful (you can of course just type it in by hand even if you delete it).

Resolution for Issue 'Is there a way to download only part of a group of AMEX transactions? The card is used for personal & business. Could I download to CSV or Excel and then import?' available: Yes (Solved).
Source: Intuit Community forum.

Is there a way to download only part of a group of AMEX transactions? The card is used for personal & business. Could I download to CSV or Excel and then import?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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