Harmony/SE is a well established methodology for Systems Engineering which leverages the execution capabilities of IBM Rational Rhapsody.
Key objectives of Harmony for Systems Engineering are:
• Identification and derivation of required system functions
• Identification of associated system modes and states
• Allocation of the identified system functions and modes/states to a subsystem structure
With regard to modeling, these objectives imply a top-down approach on a high level of abstraction. The main emphasis is on the identification and allocation of a needed functionality and state-based behavior, rather than on the details of its functional behavior.
The Systems Engineering Toolkit is installed automatically as part of the Harmony SE profile and contains a wealth of useful features for automating the building and checking of systems engineering models. http://merlinscave.info/Merlins_Cave/Tutorials/Entries/2017/2/7_SE-Toolkit_Handbook.html
If you have not looked at this before I recommend to do so and get familiar with the assets.
Johan Adelgaard - Offering Manager - Rhapsody