In the ADD New Property, add 'Walk' to the Property Type for a Character property. This would allow in a characters properties if property is selected for character, show a drop down list of all Walks that currently exist from walks other characters have. So if you have a patrol, the leader of the patrol just needs to have a walk created in the normal manner, his subordinates will use the same walk through the Character Group properties. Since properties selected in a group override other properties then this could apply for walks too that may exist or not for all characters who belong in the group.
This feature would allow dynamic switching of walks and routines of NPC's who for example may patrolling certain areas at certain times (day/night) or maybe the patrol routes are extended in this way or a walk might be an 'Active Search Patrol/Party' which this walk has much more Display 'activities' to mimic a search party communicating to one another searching for the PC. When the player is found they switch to a Passive Walk Patrol etc, by simply being moved into a different character group. And there very little display 'activities' in that walk.