QB Issue Resolution:

You do not, QB does not do that.  Loan amortization schedules are a best guess estimate, there are several web sites that will do that for you, google for them

Resolution for Issue 'HOW DO I SET UP A LOAN AMORTIZATION SCHEDULE?' available: Yes (Solved).
Source: Intuit Community forum.

HOW DO I SET UP A LOAN AMORTIZATION SCHEDULE?: 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 Amortization
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Error Recovery for Amortization [Canada]
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