QB Issue Resolution:

Are you asking a question???  If you need to have different payment terms, you have to create separate invoices.  You should probably set up progressive invoicing and invoice 25% of the total on four separate invoices with four different terms.

Resolution for Issue 'Split Payment Terms' available: Yes (Solved).
Source: Intuit Community forum.

Split Payment Terms: 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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