QB Issue Resolution:

I appreciate the details provided since it gives a quick overview on what happened to the transactions. I’d be glad to help and ensure the tax category are properly entered on your invoices.

 

At this time, you’ll need to manually open each invoice and change the category from zero-rated to tax exempt. Since the option to update the tax category by batch is unavailable, I suggest letting our Product Development Team know that adding this feature is beneficial for your business.

Ideas like this, help them decide what to include in future updates. You can let them know by submitting feedback directly.
Simply select the Gear icon in the top right-hand corner and click on Feedback. I also added a link to help give a better idea about Taxable, Exempt, and Zero-Rated Supplies–Key Distinctions Under the GST/HST.

Resolution for Issue 'How to change the tax category on multiple invoices' available: Yes (Solved).
Source: Intuit Community forum.

How to change the tax category on multiple invoices: 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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