Create sub-components within the System in the System Architecture

Is it possible to create two components as part of the System Component in the System Architecture?

My system is composed of two main components. I would like to represent both components in the System Architecture so that I can assign the corresponding functions to each component.

I have tried to create “parts” through the Project Explorer by right-clicking on Structure → System → Add Capella element → Part, as well as Structure → Add Capella element → Part, but no component is created.

No, the System is the System. At this point there are no “components” inside the system.

On this level there are only System-Functions - defining what the System does. The design decision in your case for two main components is done on the decomposition to the Logical Architecture.

Okay, understood. In this case, the two components were so obvious for this project that my instinct was to create the two subcomponents already at system level.

Thanks!