Effect for resistance

[addax]

I have a character whom is a werewolf in one of my games and for balance issues I'm granting her resistance to weapons that are not silver rather than outright immunity. How would I create an effect for it? Is there a place on a character sheet that you can put in resistances that would work automatically?

[kylania]

RESIST: bludgeoning, slashing, piercing, !silver

Then just add ,silver to the damage of silver weapons.