Generic

Adams Engine displays the following pull-down menu when the major role of a template is not single_valve_train, cam_shaft, cylinder_head, or timing_mechanism; for example, if it is a component template. Learn about Building Models.
 
For the option:
Do the following:
Minor Role
If you set minor role to any, Adams Engine connects your new subsystem to any other subsystem in the assembly having matching communicators. Learn about Communicators.
Note that for each major role, Adams Engine allows only one subsystem in an assembly with the minor role any.