QB Issue Resolution:

Quickbooks Mac does not support export / import of Invoices.

Resolution for Issue 'How can I perform a mass update on invoice transactions in QB for Mac 2014?' available: Yes (Solved).
Source: Intuit Community forum.

How can I perform a mass update on invoice transactions in QB for Mac 2014?: 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.

Support for Import
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Error Recovery for Import [Canada]
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Additional Support Options: