The relevant rules for this are foremost on ArM5 p.77 Creo (Cr) "I create" and HoH:S p.60 Creo Magic.
A&A p.70 box Replicating Formulae with Hermetic Magic addresses creating A&A p.76 Alchemical Steel.
See also Mass-Produced Reagents for another discussion on a similar topic.
Cheers