QB Issue Resolution:

When you create the PO, as long as the order cost on the alternate vendor is correct, it should populate when the vendor name is put on the PO.

Resolution for Issue 'multiple vendors for same item, how to get their order cost to appear on purchase order?' available: Yes (Solved).
Source: Intuit Community forum.

multiple vendors for same item, how to get their order cost to appear on 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.

Support for purchase order
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Error Recovery for purchase order [Canada]
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