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I found this AppD Docs page that I think may help with your question. Do let me know if it helps you out or not.
Ryan, AppDynamics Community Manager
I think you just need to delete the BT from the Controller, which will remove it as a "locked down" transaction. When it's next called it should follow normal rules and end up back at the All Other Traffic section. At least that's what I think the documentation says: https://docs.appdynamics.com/display/PRO45/Organize+Business+Transactions
You also need to make sure you don't have that BT marked as "Permanant"