You need variables (probably global) or a global data object (array, hash map, dictionary, etc.) to track all of the kills, etc. Each sprite has a UID to identify individual sprite instances.
hmm i thought i'd need some kind of variable, i'm still pretty new to all this programming, but thanks to this community i'm learning alot, can u take a look at my capx and make it work so i can study off ur genius? thanks