Feat: Master Summoner
During daily preparations, you can designate one of your spell slots to become two summoning slots of the same spell rank, from which you can cast only spells with the summon or incarnate trait.
Pathfinder 2e Database
During daily preparations, you can designate one of your spell slots to become two summoning slots of the same spell rank, from which you can cast only spells with the summon or incarnate trait.