The reason to make the time plan of a child product different from that of the promotion may include situations where the discount or specific terms for a child product need to end before the promotion's subscription ends. This is commonly done to manage financial or strategic marketing objectives, aligning product offerings with specific sales or inventory strategies.
* The discount for a child product ends before the promotion's subscription ends (B): This allows for greater flexibility in promotion management, enabling specific tailoring of offer durations for particular products within a broader promotional campaign.