The Comment-based ElementGroup as introduced by SysML1.x is deceptively powerful.
The SysML ElementGroup is adapted by the Webel Parsing Analysis recipe for SysML as the «snippet» for traceable model element elicitation.
This trail section is a pre-requisite for all Webel Parsing Analysis tutorial trails. You should also have completed this mini trail section first: 17:01: Creating custom Comment stereotypes
This topic is now also covered in more detail in a separate dedicated tutorial trail:
NEWS: New detailed tutorial: TRAIL: Theory and best practices for the Webel Parsing Analysis recipe for SysMLv1.6+