Manipulating Arrays of Arrays

I may not be handling this correctly at all, but I’m working on an AS studio application that needs to store lists of information for configuration purposes. Each configuration record contains five values. I’ve implemented this in a dummy plist as an array of arrays, but I’m not sure that’s the best way to go. I’ve not tried manipulating PLIST files from a studio app before, and I’m hoping someone can give me some pointers on the overall technique. I’ve seen and think I understand the examples of working with simple plists, but I’m not sure how to appropriately loop through the keys with nested arrays.

Here’s the example I’m working from: