QB Issue Resolution:

you receive payments from the customer and then you pay the vendor

if the customer paid the vendor directly, create a dummy cash account and deposit that portion of receive payments to that account and then pay that amount on the vendor bill from the dummy account, then pay the balance

Resolution for Issue 'I have an invoice from a vendor. Part of it will be paid by the company, part paid by a customer. How do I record the portion paid by the customer?' available: Yes (Solved).
Source: Intuit Community forum.

I have an invoice from a vendor. Part of it will be paid by the company, part paid by a customer. How do I record the portion paid by the customer?: 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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