QB Issue Resolution:

As of the moment, you are unable to upload an Excel spreadsheet with customer details and automatically generate invoices from the imported file. You’ll have to first import the customer list, then manually create the invoices. Make sure to follow the guidelines for the import to be successful.

 

Here’s how to import your contacts:

Sign in to your QuickBooks Online company and complete the import.

 

1. Under Tools, choose Import Data.
2. From the list, select Customers depending on which you want to import.
3. Select the Browse button.
4. Find and select the Excel file, click Open then select Next to continue.
5. Map your data then select Next.
6. Adjust your data if necessary then select Import.

 

Please check out this article to know more about creating own spreadsheet to import in QuickBooks Online: How to import customer Contacts from Excel.

 

Resolution for Issue 'Can i upload an excel spreadsheet with customer details in quick books and invoices get created automatically from it?' available: Yes (Solved).
Source: Intuit Community forum.

Can i upload an excel spreadsheet with customer details in quick books and invoices get created automatically from it?: 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 Invoices
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Error Recovery for Invoices [Canada]
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