QB Issue Resolution:

QBO does not have an item that will work as a percent

so you have to create a service item, and manually calculate the % for the fee and enter it

QBO also does not have a line item sub total either

Resolution for Issue 'how do I charge a delivery fee as a percentage of the customers total bill with quickbooks online?' available: Yes (Solved).
Source: Intuit Community forum.

how do I charge a delivery fee as a percentage of the customers total bill with quickbooks online?: 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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