The circuit diagram shows two twin-coils in a 4 cylinder, 4 stroke engine. If you are running the standard control unit, labeled "ignitor" on the circuit diagram, which drives the coils, that only has two outputs, one for cylinders 1 and 4, and one for cylinders 2 and 3.
You then need to fire 4 spark plugs at the same time for two plugs per cylinder.
You could just put all the primary windings in parallel. The risk is that you would overload the control unit, or not get enough current to the coils.
The current in the primary windings of the coils has to be limited to stop them burning out. Years ago they were limited by the coil resistance, so they would stand 12 V continuously. More recently, they are limited by current limiters in the control unit, and often the control unit will only turn on for the time it takes for the current to get to the desired level before turning off and making the sparks. Unless you know what is done in the control unit, and the ratings of the coils you want to use, you might not be able to get them to work very well together easily.