The idea is having a master blueprint, like for locomotion, and it can “Reference” child-locomotion blueprints like “run” or “jump” without needing to checkout the MASTER blueprint.
MASTER blueprint - houses main information with referenced children blueprints.
CHILD blueprints - these house run or jumps or combat
The Goal being that one person can have the MASTER checked out while another person can have just RUN blueprint checked out.