Changing Priority 
The priority of a work item is a measure of its urgency.
It can be used as a sort criterion for organizing the workflow inbox. This function is only available for dialog work items.
Features
End users can display and change the priority of a work item. The priority is between 1 (highest) and 9 (lowest).
The change in priority can also be passed on automatically to the superordinate workflow and then to all work items created subsequently. The Pass on priority to subsequent steps indicator must be selected for this to take effect.
Note
If a higher priority (lower number) is defined in the workflow definition for one of the subsequent steps, it is not changed.
End of the note.
Activities
Choose Change Priority in the Business Workplace under 
Other Functions....