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There is a Legacy version here.

PFS StandardSplit Hex [one-action] Feat 18

Concentrate Spellshape Witch 
Source Player Core pg. 191

You siphon some of the power from an offensive hex you cast to direct it at a second target as well. If the next action you use is to Cast a Spell to cast a harmful hex with a single target, reduce its rank by 2 (making it 2 ranks lower than the maximum spell rank you can cast). If you do, you can select a second target for that hex to affect.

Traits

Concentrate:

An action with this trait requires a degree of mental concentration and discipline.

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. Any additional effects added by a spellshape action are part of the spell's effect, not of the spellshape action itself.