Slackerman, Thanks for tacking the time to answer me !!!
My mistake, I am quite new in WP adventure 🙂
I should mentioned that the site 1 (origibnal) will still operational when the site 2 (the cloned site 1 will be change in ALL content and SOME pages names, domain will be different, only Lay Out (structure and color will still the same))
Which steps will be necessary then ?