I assume you mean in the entire eqdkp site not just raidplanner. In that case I believe you would edit
Code:
$classes = array(
array('Unknown', '',0,50,0),
array('Trooper', '',0,50,1),
array('Smuggler', '',0,50,2),
array('Jedi Consular', '',0,50,3),
array('Jedi Knight', '',0,50,4),
array('Bounty Hunter', '',0,50,5),
array('Imperial Agent', '',0,50,6),
array('Sith Inquisitor', '',0,50,7),
array('Sith Warrior', '',0,50,8),
and delete the ones you don't want. The first 4 on the list I believe.
and then edit
Code:
var $version = '1.0';
and change it to 1.1 to make the changes to the database. (By running update in admin)
I just started playing swtor so I haven't had much time to work on an swtor eqdkp site. But that's where I would start.