Skyrim Creation Kit: Adding Perk Ranks and New Perks to Skill Trees

Creation Kit tutorial on how to add new ranks and adjust trees for new perks. addendum certain perk entry conditions require you to check that the player does not have a higher rank of a perk to proc the right effect. Bullseye needs check hasperk on Rank2 == 0, Rank2 needs check hasperk Rank3 == 0.