use globals

hi. how to use globals?
i want to make my inventory on level2 Scene and so, that the changes in that inventory would make influence on the player of level1 Scene.

or maybe using “addoverlayscene” would work same as the object is in level1 scene , or still on level2 scene?

(got to do that, becouse got problem in adding UV planes from layer2 to layer1 - cant see UV cause of strong lighting from somewhere no idea - my plane is shining white , cant see the image)