QB Issue Resolution:

It would be convenient to be able to do that.

As you have discovered, there is not currently a way to create a purchase order from an invoice in QuickBooks Online other than the workaround that you described.

Please submit your request through the feedback option. You can do that by clicking on the Gear at the top of a main page and selecting Feedback. Requests entered there will be considered by the software engineers for inclusion in future updates.

Resolution for Issue 'How to create a purchase order from an invoice in QB Online?' available: Yes (Solved).
Source: Intuit Community forum.

How to create a purchase order from an invoice in QB Online?: 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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