You can create a task or notification definition at the process or scope level and then use the task or notification in many People activities. Within each people activity, you can modify the priority and people assignments that were originally defined.
To Override Original Assignments and Priority:
Select a people activity to put the Properties view in focus.
On the main People Activity tab, create a new expression for the priority.
On the Assignment tab, create new assignments for this activity.
The Assignment tab differs slightly between a People Activity and a Guide Designer.
The above snapshot has an Override column. This column does not appear if you are creating a Guide Designer. It is not there for Guide Designer because you do not need to override or go to the associated task.