Thank you Saul, that worked perfectly!
With regards to your message at:
> You can achieve the same result using layer masks. Unfortunately,
> there is not a simple built-in way of copying a layer mask to
> multiple layers or of applying a layer mask to multiple layers.
> There is a script-fu plugin that will do that. I don't know
> where I got it. It doesn't seem to be in the Gimp's plugin
> repository. So here it is:.........
I wondered if you knew of a script that would also APPLY the copied layers as
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