How to change the Time Slot on an activity via Message Scenarios

Summary:

We'd like to modify the Time Slot on activities, during specific situations, and would like to use message scenarios to do so.

Content (required):

There are specific situations where we'd like to change the time slot on an activity to one that correlates to a new Start time after an activity has been moved on the tech's route. For example, if the activity is moved from the original 8-10 time slot, and now has a new Start of 11:30, we'd like to change the Time Slot on the task to 11-12 since the Start time starts with "11:". (We'd like to do this as an inner message step of others when they run successfully.)