QB Issue Resolution:

Before editing the template, start with the existing Standard Service Invoice. “Reference” is probably the invoice number in QuickBooks.

The trick is to set up items to contain the things you invoice. Lets see if someone else has a good suggestion for how to set it up.

Resolution for Issue 'How do I create/add new fields to the' available: Yes (Solved).
Source: Intuit Community forum.

How do I create/add new fields to the: 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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