My brain was somewhere else. I'm in the middle of modifying what gets saved in the report body and gave a bad answer.
In the sequential model Test UUT's entry point, there is a action step to a dll. the step name is 'Determine Report file Path'. This writes the path to Locals.ReportFilePath. You can add a step after this to modify the path and add the lot number. It's just an edit of a string
