The fastest way to get to the damage for each character is on the tactical console (View menu - show tactical console or ctrl-t). There's a look-into button on each character (it looks like an eye) that pulls up a panel of HP, tracked resources, conditions, adjustments, and notes.
I'm not sure how useful a "damage many" option would be - didn't some of the undead affected make their saves and take half damage? That means you need to go in there twice, adding half damage the first time and adding the remainder the second time, being careful which creatures to select each time. There are very few effects like Channel Energy that affect many creatures, all at the same level of effect.
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