QB Issue Resolution:

don’t delete the line items not included with the bill. enter a quantity of 0 for the items you didn’t receive. that keeps the PO open.

Resolution for Issue 'How do I link multiple bills to one Purchase order?' available: Yes (Solved).
Source: Intuit Community forum.

How do I link multiple bills to one Purchase order?: 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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