How do I make items/powerups come with in the next scene?

I have a basic problem I think, when the character touches items/powerups they'll go into itemslots. But when the character touches a door or heads to the next scene/stage (not a frame), the items/powerups are not in the itemslots anymore even though I added them to the next scene (mainly their just outside the itemslots).

How do I get the game to keep the progress as the character enters other scenes/stages? 
I don't know if flash games only work on one scene or if I setup arrays or sharedobjects.