When you invoke the SAS/ASSIST module, it creates sample datasets for you in your SASUSER data library. On Sun workstations, this is the directory ~/sasuser/sun4m. If you delete all the files in this directory, it will recreate them the next time you start ASSIST. However, you can delete everything except profile.ssd01 and sasparm.ssd01.
You can also save yourself time by executing these commands at your athena%