Create an array variable of type Particle System Reference
Then either add the particle files to the array or use the Add node to add all those particles to it on EventBeginPlay or some similar event.
This array willnow allow you to manipulate all of them individually (index 0 = particle1 so Get(1) node would work on ‘particle1’) or you can use a for/foreach/while loop to do things to all of them.
Edit: sorry your variable type should be particle sytem component reference
With that many particle system components you might want to create a function that takes in a particle system component and adds it to your array so that you dont have to connect 2 wires for each one, only 1.