Hello @dcseats !

Wow, lots to break down here! Cool!

Let's get the bad news out of the way first. Your setup will work fine except for one thing: USB connected printers are only available to the stand it is connected to. So you won't be able to send orders to the individual stations. The only printers that can be seen by multiple stands are ethernet or wifi printers. This will be your only downfall to your plan, everything else can be accomplished easily.

For the rest of my response, I'm going under the assumption you've updated your printers to be seen by every device.

If you're using the Square Point of Sale:

Getting specific categories to print to specific printers is just the matter of setting up correct printer stations and assigning the right categories to it. This will work for your dining room tablets, server tablet, kitchen tablet, and cashier tablet.

For Square Online Orders, I recommend making one of the tablets (probably the cashier one) as the designated online order terminal. When you're in the printer stations, there is a configuration for online order tickets. In there, choose to Automatically Print the tickets, and assign the categories as needed. All online orders will print without your intervention after that. Word of advice: don't have multiple tablets set to Auto Accept online orders: you will get multiple tickets for the same order.

For adding onto the order and having the cust come to the register to pay, you'll need to enable Open Tickets. Instead of closing out every ticket as it's created, you can choose to save the ticket under a specific name. Within 1-2 seconds of saving that ticket will be available to every square device that's logged into your location. Adding items onto the order is simply the matter of reopening the ticket, adding the item, then hitting save. Only the new items will print. Closing the order is just as easy: open ticket, tap charge, tap tender type. You can do this at any tablet that sees the ticket.

If you're using Square for Restaurants, things will be a little different. That's not a product I'm overly familiar with, though, so if you are let me know and I can get some other Super Sellers involved.

Hope this helps!