Within the Action element dialog, there is an option to Handle action internally:
This option is only available if the Action is being modeled as a system.
Even if the Action is being modeled as a system, the checkbox is defaulted off.
This checkbox controls how Actions that are defined as systems handle action triggers. If the box is checked, the Action triggers are automatically routed to internal Action components and the OK and Failed triggers become available (for handling responses from internal elements).
Learn more about:
Modeling a Reliability Element as a System with Child Elements