Well usually I just set them to "None" in the Object Editor. However, the main reason why I'm asking about it is because I'm trying to base a spell off the Fire Lord's Incinerate, but I don't think the damage bonus is quite working.
:EDIT: Also, any ideas on how I might get the spell to work? It looked simple enough from the outside, just doing what I've done before. Copy the spell, rename it, change the stats, and put a trigger to work with it if necessary (in this case not so much, as the new spell is pretty much a carbon copy of Incinerate except without the explosion on death). Except that the bonus damage doesn't work.