The link is a sample spreadsheet with the problem described.!Aj3XHKj_St7wwn5UxOa_-4dCwB1b

Basically, I just want to see the bestseller in each department, based on the shift. Over the past 2 months.

What is the first step in the process? I will study to complete it. Then what next. etc.

If you can't tell I have no formal education in this. So any help is appreciated