Referring to background layers help

Hey all,


if (layer_exists("Mountains"))
{
layer_x("Mountains",x/2);
}

Thats working great but I want to refer to its sub layers as well, I have selected "inherit sub layers" on my background layer but still doesnt seem to work also wont work if I put them in a folder and refer to the folder.

any help would be greatly apprectiated .
 
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