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Deriving a Requirement from Another
The Derive relationship is a relationship between two Requirements, used to describe the fact that one Requirement is based on or is an extension or derivation of another Requirement.
The Derive relationship is available from relationships page of the SysML Requirements Toolbox.

The two Requirements are typically at different levels of abstraction or resolution. A Requirement in a low level specification might have a Derive relationship to a Requirement in a higher level specification. The lower level Requirement is typically derived from the higher level Requirement as a result of investigation, elaboration or analysis. The important aspect of this relationship is that if the Requirement at the arrow end of the relationship is changed, it is highly likely that the derived Requirement will need to be reanalyzed.