The verb reassign means to move someone or something to a new location, department, or position. If your department was in the Cincinnati office but then your boss moved you to the Chicago office, you were reassigned.
Reassign is a combination of re-, meaning "again," and assign, which is from the Latin word assignare, meaning to mark out. Today reassign is often used in work-related discussions to indicate a transfer. If your boss says, "I'm going to reassign you to the Peterson project," you may be flattered that your boss thinks highly enough of you to put you on such a high profile project. But when reality sets in, you realize that your boss just assigned you tons of extra work for a cranky client. Congrats!