With the Automatron add-on installed, the Sole Survivor can create and install a variety of robot modifications to Codsworth, Curie (before becoming a synth during Emergent Behavior), Ada, or any number of new automatrons created from scratch. This can be done at any robot workbench, which can be built at any friendly settlement after completing the Mechanical Menace quest, and receiving the robot workbench schematics. The Nuka-World add-on included 15 new parts for more customization options.