This might actually help me with a project I'm working on. Not a game, but an app. I'm having trouble getting selected images to be replicated on a bar. Someone pointed out that using a global array might be the best thing to use. I'll have to dig into the explanations that Reefpirate gave. You've helped so many people with a few posts!
Yes, you want to be using global variables, but you want to be using global arrays.
There are tutorials in the tutorial section, but quite simply the first thing the player clicks will be added to the array, and the display bar will update to show the image sprites in the array. Same with the second thing, etc.
Were you referring to something like this tutorial?