QB Issue Resolution:

In the Pay bills screen, if you go to the far right column,you can enter in the amount you want to pay.

Resolution for Issue 'how do I pay part of a bill?' available: Yes (Solved).
Source: Intuit Community forum.

how do I pay part of a bill?: 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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