To see your coworkers in your dream, highlights aspects of your real life relationship with them, including difficulties or how well they support you.
It signifies your ambition, struggles and competitive nature.
If the coworkers in your dream are not your actual coworkers, then they may symbolize some psychological aspect of yourself that you need to work on.
If you dream that you are training a coworker to take your place at work, this means you are making progress with respect to some task or inner development. You are leaving behind old attitudes and are looking toward the future.