Mirror site issue – URGENT!

I’m helping a friend set up another site for his business, that utilises the same database as his existing site.

All he wants to do is sell the same goods from 2 different sites, which in theory shouldn’t be difficult.

The problem is, all the links in the mirror site point back to the original site, both front and back end.

What I’d like to avoid, if possible, is rebuilding the new site from scratch.

I’ve searched these forums, and it appears many other people have had the same problem, but their questions here get unanswered, and the topics are closed for future replies: why is this? Does no-one know, or are we forbidden from discussing it, or what?

Any advice would be most welcome…