Select one or more priority grouping rules to determine the priority of studies in the workflow.
To select a priority grouping rule
In the List area, click Worklists.
In the Worklist Library, under the appropriate type of worklist, click New.
or
Right-click an existing worklist and select Edit.
Switch to the Priority Grouping Rules tab.
From the Available Rules list, select the priority grouping rule you want to include in your worklist.
Use the Shift and Ctrl keys to select multiple priority grouping rules.
Click
.To remove a priority grouping rule from the Selected Rules list, select the rule and click
.Use the
arrow to move the priority grouping rule up in the order and the 
arrow to move the priority grouping rule down in the order.