Under Modifications > Character Settings, near the bottom under GMG Non-Exclusive Variant Rules, there's a checkbox for Dual-Class PCs. If the characters are made within the Campaign using the Campaign Options it should be automatic.
(I'm using Dual-Class for my Age of Ages game.)
Currently Running: Pathfinder Second Edition
Currently Playing: Pathfinder First Edition, Star Trek Adventures
Former HL Games: D&D 4e & 5e, Mutants & Masterminds 2E & 3E, Savage Worlds
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