The pizza production is made up of three steps:
Each station takes care of part of the pizza production process and then sends it along to the next one.
The first station makes the pizza while the second station cuts the pizza into slices.
Lastly, the third station boxes the pizza slices and sends them off to be sold.
With the money you'll earn you'll be able to buy a whole lot of different upgrades that will allow you to increase your earnings even more so.