I remember when I worked in a grocery store when I was in college; my assistant store manager was the one who did the scheduling for the baggers and the stock personnel.
He was also in charge of handling any customer complaints and also had to train incoming stock personnel on the job. This mainly dealt with teaching the stockman how to order and replenish stock. It was quite a job.
He also had to coordinate floor moves because every now and then the store would change around the stock and moved items to different aisles.