Yes, you can store/export a session for the time period you want, create/copy the business transaction to the session (If it already exists you may need to delete it from the session and recreate). Then right click on the session and select "Process Configuration changes." This also works for Measures as well.
Once the data is saved into a session file, modify the session and create your necessary measures and BTs. Then right click on the session file and select "Process Configuration Changes". Then reopen the BT and your results should be visible. As Srikar mentioned, this can take a while if the session file is large.