There is a Legacy version
here.
Inventor Feat 2Downtime General Skill Source Player Core pg. 257 2.0Prerequisites expert in
Crafting
You are a genius at Crafting, easily able to determine how things are made and create new inventions. You can spend downtime to invent a common formula that you don’t know. This works just like the Craft activity: you spend half the Price of the formula up front, attempt a Crafting check, and on a success either finish the formula by paying the difference or work for longer to decrease the Price. The difference is that you spend the additional time in research, design, and development, rather than in creating an item. Once it’s complete, you add the new formula you invented to your formula book.
The GM might allow you to invent uncommon or rare formulas, typically with an increased DC. You need the Alchemical Crafting feat to invent alchemical formulas and the Magical Crafting feat to invent magical formulas.
Traits
Downtime: An activity with this trait takes a day or more, and can be used only during downtime.
General: A type of feat that any character can select, regardless of ancestry and class, as long as they meet the prerequisites. You can select a feat with this trait when your class grants a general feat.
Skill: A general feat with the skill trait improves your skills and their actions or gives you new actions for a skill. A feat with this trait can be selected when a class grants a skill feat or general feat. Archetype feats with the skill trait can be selected in place of a skill feat if you have that archetype's dedication feat.