this is a demo, a system that stock data in a Array.

How to use Arrays ? look here > http://www.gamemaker3d.com/forum/general-discussion/178-arrays

How to store data ? look here > http://www.gamemaker3d.com/forum/examples/180-data-structure-array-in-a-array-experimental#463
(it's example for the structures but the operation and even for Array)