This could be a new series of key commands, that would work alongside existing cut, paste, and copy commands.
The cut/copy/paste message at the bottom left would be changed accordingly, to: "Click and drag to specify an area to [copy/cut] ONLY DECO. (right click = cancel)".
The pasted in DECO would look just like a normal paste (in the placement box) and can be moved around accordingly, but when placed, it would apply that DECO to the area clicked. Think of this like painting a specific area.
Key Binds:
hmmm
I think there's a console command for this? Correct me if I'm wrong.
Yeah, deco storage would be perfect.