Is it possible to copy a layer from one layout and paste (or replace) in another layout in the same project in C2?
You can click in the layout view, press Ctrl + A to select all, then Ctrl C to copy, click in the new layout view where you want everything to go, then Ctrl + V to paste. I don't know of a way to cleanly do it, though.
Is this for UI purposes?
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Just set layer's Global property to Yes
https://www.scirra.com/manual/85/layers Global Layers
MadSpy I think Global Layer property setting is just what I need. Thank you.