QB Issue Resolution:

Turns out that this is such a common request that there are a bunch of QB add-ons that do exactly what I was hoping for. I can do the back-end programming myself or just purchase an add-on. Voila! Thanks for those who contacted me privately with this PERFECT ANSWER.

Cheers to the experts!!

Resolution for Issue 'I know I can add mileage charges to invoices. But is there a way to automatically apply mileage charges to every invoice created for a specific customer?' available: Yes (Solved).
Source: Intuit Community forum.

I know I can add mileage charges to invoices. But is there a way to automatically apply mileage charges to every invoice created for a specific 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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