QB Issue Resolution:

assuming the funds stay in the same account use a zero sum check

write checks, set the check number to ach or something, list the account, the amount and the class that you are transferring to

list the same account, the amount as a negative and the old class

Resolution for Issue 'how to transfer funds from one class to another?' available: Yes (Solved).
Source: Intuit Community forum.

how to transfer funds from one class to another?: 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 funds
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Error Recovery for funds [Canada]
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