QB Issue Resolution:

You would need a third party importer, check the app store

https://apps.intuit.com/

this is one many folks use
http://www.baystateconsulting.com/products/01TxnWizardOE.htm

Resolution for Issue 'How can i upload sales and purchases from Excel' available: Yes (Solved).
Source: Intuit Community forum.

How can i upload sales and purchases from Excel: 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 app store
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Error Recovery for app store [Canada]
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