Add an array of arrays and uses index to acces your value. In example, here I use the second array to populate my ComboBox named myList:
[script]
foodArray = ["fruit", "vegetable"]
fruitArray = ["apple", "orange", "banana"]
vegetableArray = ["carrot", "celery", "cucumber"]
currentArrays = [foodArray, fruitArray, vegetableArray]
myList.setDataProvider(currentArrays[1])
[/script]
Jorge