Thank you Jackie

I think I'm getting nearer to understanding how it works.
Not sure which way would be easier for me, but in any case I'd better put a comment at the top of my kobopatch.yaml to remind me what to change!!
ps used the way I initially said and it worked fine once I'd put the - in the right place on the uncommented line!!!!
Will bear the other way in mind if I confuse myself on the next patch version
Edit: Just thought, all I need to do is copy over the amended libnickel.yaml to the new src folder