Just to add on to this: what crafty_one is referring to are called plays-- like a four person play might include a register, a bar, a customer support, and an order support. In this case, when I'm on register, my job is to stay planted at register and trust that my support will do warming, gathering, etc--if anything, in down moments when I'm planted where there is no line, I might clean up the area right around me, restock the stuff easily available, but that's dependant on me being able to drop it immediately if a new customer walks in.

The biggest thing to remember is communication-- both with your other partners and your customers. When you're deployed in register, ask if you have an order support/ what you're responsible for. With customers, when you have support, get in the habit of educating them on what to expect so they don't get antsy-- "Brian is getting your coffee and will have it right out" or "Maria is throwing your banana bread in the oven and will have it on the other side of the bar." When you don't have support, always remember you are still responsible for being the first partner a customer interacts with, and communicate that they are seen and welcomed-- "Hi Sir, I'll be with you in just a sec." "Hi ma'am, how are you today? Let me just grab the oven and then I'll take your order."