In inclusion substitution, the second clause expresses a meaning associated with the first without simply listing one physical part of its referent. It may highlight a relevant aspect, a consequence, or a characteristic implicit in the earlier statement.
A teaching example is: «أَكْرَمْتُهُ، حَفِظْتُ لَهُ قَدْرَهُ» (“I honored him; I respected his standing”). The second assertion can clarify what the honoring involved. Whether this qualifies as rhetorical substitution or an independent report ultimately depends on context.