scripting a file/folder copy on windows server

Hi

I need help writing a script to copy a bunch of files.  I am trying to relocate users' my documents folders.

currently they are stored in this location:
"\\servername\username\" (each user is shared individually.  all username folders have the same "documents" label because of the desktop.ini file -very confusing)

i would like to move them all to:
"\\servername\sharename\username\my documents\"

so far i have this running as a loggoff script but it isnt ideal:
robocopy "\\servername\%username%" "\\servername\newshare\%username%\My documents" /mir /sec

what would be the best way to move the files directly on the server without using logon/off scripts?  

thanks for help