In CranSoft when I had a report like tvMyReport_Sel and I set it to segment by field Name I would get all reports in the folder with names like:
- tvMyReport_Name2_Sel, etc
In DSP I am getting one folder per name and all have the same file like tvMyReport_Sel.
Go to dspMigrate>Advanced Configuration>Parameters>Transform tab and check the box for "Segment Single Dir" which will get you the functionality you are looking for. Be default this is not checked.