Lingotek offers a feature that allows you to divide your translators into separate teams. This is useful because you can assign tasks to entire teams rather than having to assign the tasks out to the users individually.
Optionally, you assign a team to handle a workflow phase. That way, the workflow automatically assigns a team to handle translations and reviews for the entire project. You will not not need to manually assign each document. Simply create a team and then add that team to the workflow.
Visit the Lingotek Support Center.