Thanks for the reply
Template did the trick, though it should be noted the used Smite Good seems to describe a different version from some class, and not the Monster Manual version.
Have a follow up question:
Adding a Stock Undead of a Human Zombie Warrior works perfectly, however, when adding a Human Zombie Commoner, an error is displayed that it requires inputting Hit Points, spending skill points, and seemingly is unfinished. Is there a reason for this?
Edit: Sorry, turns out the "Human Zombie Warrior" was in fact "Human Skeleton Warrior." I suppose Zombies just present a unique problem to the program, hence the errors. It seems the program wants me to still pick a Feat, and although 13 HP are placed in the box, the program is not recognizing it and not showing any 0/0 HP.