QB Issue Resolution:

Class and location tags are internal and for reporting, as a result they can not be set to print on the donor copy

If the funds that are being donated to are constant, you could make a service item for each fund with preprinted description of the fund so the donor can see what the donation is for

Resolution for Issue 'I want to print class codes on sales receipts.' available: Yes (Solved).
Source: Intuit Community forum.

I want to print class codes on sales receipts.: 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 class codes
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Error Recovery for class codes [Canada]
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