Final answer:
The feature that allows a user to group campaigns within a specific marketing program or initiative is Campaign hierarchy.
Step-by-step explanation:
The feature that allows a user to group campaigns within a specific marketing program or initiative is Campaign hierarchy.
This feature organizes campaigns in a hierarchical structure, where campaigns can be grouped under a main campaign or initiative.
For example, a marketing program can have multiple initiatives, and each initiative can have multiple campaigns associated with it. Campaign hierarchy helps in managing and organizing campaigns effectively.