Layers Drawers (left of both drawings shown):
EazyDraw has great layers support.  Each drawing has it's own layers drawer.  The layers table view has full cut/copy/paste support -- for the whole layer.  Or just drag and drop a layer from one drawing to another, it couldn't be easier.  To change a layers position in the drawing order - just click and drag.

Layer scope color modification (middle of the layers drawers):
You can apply a color modification to any layer.  Blend in a tint, transparency, or both to any layer.  Great for advanced effects or when working on drawings with several layers.

Transparency fully supported by OS X:
You don't need to use the layer color modification feature to work with transparency.  Transparency is supported, individually, for any color used on your drawing.  This is a capability provided by the OS X Quartz graphics engine and made available to our users.  Layer color modification is one more way you can design with transparency (color, patterns, blends, gradient fills, ...).