I want to mark 1 out of 3 SEF's as used AND change the SEF url of the one being used. What is the right procedure? Do I first mark the one as used, then change change it and then Save+Move? And do I then unpublish the other 2?

And if I am sure no search engine has indexed the original SEF, can I actually just save the changed SEF as a custom SEF instead of moving it?

Or do I do it differently?

I want to mark 1 out of 3 SEF's as used AND change the SEF url of the one being used. What is the right procedure? Do I first mark the one as used, then change change it and then Save+Move? And do I then unpublish the other 2?

And if I am sure no search engine has indexed the original SEF, can I actually just save the changed SEF as a custom SEF instead of moving it?

Or do I do it differently?

Do I first mark the one as used, then change change it and then Save+Move? And do I then unpublish the other 2?
Unpublish/trash the other 2 then change the left and Save+Move, no need of Used.

And if I am sure no search engine has indexed the original SEF, can I actually just save the changed SEF as a custom SEF instead of moving it?
Yes.

Thanks, I am getting there I noticed that v1.5.4 create less sef url in total for Zoo, which I am happy about. It is getting more accurate.

It's not from AceSEF but from Zoo 2.1, they've fixed the ItemID issue which couses duplicated URLs.
Anyway, I'm marking solved. If you keep being happy, remember you can post post a rating and a review at the Joomla! Extensions Directory extensions.joomla.org/extensions/site-management/sef/10019