I've searched the Yahoo groups and the PCGen website, but can't seem to find any up to date info on how to add a new race to PCGen.
Specifically I'm trying to add the variant Tiefling races from Council of Thieves (even more specific, the Rakshasa variant).
Any help out there, I know some of you are active in the development of the program.
Okay, I seem to have figured it out... I hope.
I made sure I had the newest data set for PCGen (which includes the Bestiary). Then I copied the Tiefling data from the bestiary .lst file into the main race .lst file for Pathfinder, changed the name to "Tiefling (Rakshasa)" and changed the ability score adjustments before saving the file. Then it showed up in the races list when I created a new character.
One would have to write up a special power, depending on the result on the variant power list, but I was lucky and rolled a +2 Int bonus, so I just added that manually to the character's ability scores.
http://pcgen.sourceforge.net/autobuilds/pcgen-docs/
Click on List Files > LST File Class > Lessons 3-6
Also you can ask questions on PCGen List File Help yahoo group