You can transition multiple items into a new status or state by selecting Batch transition. In List or Reading View, select all items that need to be transitioned by checking the box next to the appropriate items. Select Actions > Batch transition.
Jama can only Batch Transition Workflow items with the same state. For example, you could batch transition all "In Progress" items to a "Complete" status, but you could not select both "In Progress" and "Proposed" items for batch transition.