Copying glyphs from extrapolated master

Say, I have 2 masters with weight axis, in the bold master the lowercases are lighter compared to the other glyphs. I created an extrapolated master (Black) to add more weight for lowercases. Now I want to take these lowercases and put into the bold master, keep the other letters same and delete the extrapolated Black master.

Mekkablue’s script collection has one called Copy Layer to Layer which will do that for you.

Thanks. Just tried that one but it doesnt also copy other layers in the new master. I also want to copy Color Palette Layers in selected master to another, if possible.