Create a layer from part of another layer

Suppose I have a LB file like so (shapes.lbrn (28.7 KB) and first screenshot)
I burn it and decide I’m not quite happy with it such that I want to burn it again, but just part of it, indicated by the green in the second screen shot.
How can I accomplish this?
One cheat I’ve come up with is to lift the lid of the Boss when I don’t want it to burn, but that is really a hack and is time consuming.
What’s a better way?

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