QB Issue Resolution:

Let me help you enter the old invoices into QuickBooks Self-Employed.

We’ll need to manually enter the invoices since we can’t import them using an Excel file. To enter the invoices, just go to the Invoices tab and click Create invoice. You can enter the client information, date, description (work, expense, trip), and select either to send the invoice or save it as draft. Since these are old invoices, you can just enter a dummy email address and click Send invoice. Once the invoices are sent, you can mark them as paid.

Resolution for Issue 'Can I insert old invoices I do on excel into QB self employed? I use excel and am happy doing that.' available: Yes (Solved).
Source: Intuit Community forum.

Can I insert old invoices I do on excel into QB self employed? I use excel and am happy doing that.: 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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