How can I use a variable to define other variables ?

@jimyaccino
Perhaps you could generate it like this…

myArrayX = ["instrument", "gnss", "surveyor2", "rt4"]
myArrayY = ["instrumentOptionHits","gnssOptionHits","surveyor2OptionHits","rt4OptionHits"]

if (sel === myArrayX[0]) { 
    instrumentOptionHits = 0;
} 
for (var i=1;i<10;i++) {
 else if (sel === myArrayX[i]) {
        myArrayY[i] = 0;
    }
}