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There is a Legacy version here.

PFS StandardNonlethal Spell [one-action] Feat 2

Manipulate Spellshape Wizard 
Source Player Core pg. 201 2.0

You can alter offensive spells to be less deadly. If your next action is to Cast a Spell that deals damage and doesn’t have the death or void trait, that spell gains the nonlethal trait (page 407).

Traits

Manipulate:

You must physically manipulate an item or make gestures to use an action with this trait. Creatures without a suitable appendage can’t perform actions with this trait. Manipulate actions often trigger reactions.

Spellshape:

Actions with the spellshape trait tweak the properties of your spells. You must use a spellshape action directly before casting the spell you want to alter. If you use any action (including free actions and reactions) other than casting a spell directly after, you waste the benefits of the spellshape action. The benefit is also lost if your turn ends before you cast the spell. Any additional effects added by a spellshape action are part of the spell's effect, not of the spellshape action itself.