How can I copy a substack?

[Graham]

Folks, I've somehow deleted a whole substack from an app I'm working on 
(RunRev also crashed, but I can't repeat the error). I do have a backup 
(phew!) but it's a tad out of date in respect of other parts of the file. 
Therefore I want to copy the whole lost substack from my backup to my 
defective working version, but I don't see how to do it. There is no 'copy 
stack' feature either in the IDE or in the Transcript command set. I feel 
this has got to be possible but I need help.

TIA

Graham

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Graham Samuel / The Living Fossil Co. / UK & France