I understand (at least a little) about how masking works. As far as I see it reveals layer underneath it.
What I am wondering if there is some ways to reveals different(multiple layers) layers or masking is done only on one layer.
I have searched and some pages suggest it is possible to mask multiple layers but it doesnt actually show any examples or step by step tutorials.
Any help would be appreciated,
The Help on masking has a heading "Mask additional layers after creating a mask layer" that might point you in the right direction.