Note the Subject name is the last name in the screen.  From the below example the primary subject name would be SITENUMBER6
This self signed certificate would be valid for 3650 days or 10 years

selfssl /T /n:CN="SITENAME1,CN=SITENAME2,CN=SITENAME3,CN=SITENAME4,cn=SITENAME5,CN=SITENAME6" /k:2048 /v:3650 /s:SITENUMBER