Large layouts, layering different Tiled Backgrounds

I'm working with large layouts (8000,4000 and larger) and would like, for the sake of memory and performance, to use layers of Tiled Backgrounds to provide a basic rich background upon which to add a layer of fixed decorative sprites.

Is there a pattern of layers, images with transparency (to define the area of the tiled background for a given layer), and tiled backgrounds (and blending mode) that can do this?

For example:

Layer 0 - Trees (the forest, 100% layer coverage)

Layer 1 - Grass, the playing area, driven by a PNG with transparency

Layer 2 - Water, a river (which should also block the characters), again, a PNG with transparency

Layer 3 - Fixed sprites to decorate

Thanks,

Jason

I figured it out.

Layer 0 - Forest:

• Full layout tiled background.

Layer 1 - Grass (playing area)

• PNG image with solid white for the playing area (where the grass will be) and transparent where the forest should be visible.
• Layout Property - Force Own Texture = Yes
• Tiled Background (full layout) property - Blend Mode = Source Atop

Layer 2 - Same as Layer 1

Layer 3 - Just fixed sprites.