Yes, longlisted applicants can be moved between one ‘pile’ to another. To do this you will need to go into the individual's application and select 'change pile'.
If you are moving an applicant between piles, we would advise adding a note, especially when moving an applicant to Pile 3 as these applicants will be rejected.
Guidance on longlisting in Trac
You can find instructions on how to longlist in the Trac User guide.