QB Issue Resolution:

Tagging all invoices automatically to a specific customer is unavailable. You’ll need to do it manually by opening each of the invoices involve. From there, change the customer and the class to your desired one.

I’ll also make sure to take note and share this preference to our developers for future updates.

Be sure to visit the Community space if more assistance is needed.

Resolution for Issue 'how can i automatically tag all invoices to a specific customer under a specified class?' available: Yes (Solved).
Source: Intuit Community forum.

how can i automatically tag all invoices to a specific customer under a specified class?: 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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