Help with Logitech Saitek Pro Flight Throttle Quadrant

Hello! I have a question about Logitech Saitek Pro Flight Throttle Quadrant. How it's possible to have more throttle levers because it only has three levers and if I want to fly an airplane with four engines. Do you have to add more levers or can you make it that you can choose for example one of levers to control the left side engines and then you could choose with a button or something similar which one of the left engines you're going to adjust or both of them at the same time and if that's not possible then do you have to buy another unit? And because I don't want to buy same unit again and if this isn't possible (choosing the buttons to control engines) then could you suggest me something similar unit but with more levers?(6 levers would be nice) By the way if you didn't understand all ask me!;)

Yes, the throttle quadrant​ that comes with the yoke is ps/2 connection. Look on Amazon or eBay and you'll see usb throttle quadrants. Only difference is the cable connection

 

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e = select engine

e then 2 = select engine 2 (keys pressed quickly after each other)

e then nothing for a few seconds = select all engines.