How do Green Arrow and Speedy distinguish between their various flavors of trick arrow when pulling them from their quivers? It seems like they pull one at random and it’s conveniently the one they want by coincidence. Batman, Robin, and Batgirl at least have separate compartments on their utility belts that they must have had packed and organized beforehand. Arrows rattle and shift around in their quiver all the time, especially with all the running and jumping and rolling.
Maybe he creates all of them the same way and if he applies pressure in a certain way or moves something within the arrow, it changes what it does. For instance, (until I come up with a great example), like a pocket knife, which has different actions for one tool. Or, in video games where you can have a gas arrow, press a directional key, and then you have a water arrow.