>> Domain-mapping config

I would like to map different domain for example domain0.com, domain1.com, domain2.com and domain3.com
I ve got 4 different IP , one for each domain, On my server each domain have a different IP
Question :
Must all domain use the same IP on the server ? or must I add a line in domain-mapping > mapping option tab and add an IP ?
On Tools, no domain-mapping menu, why ??
I forget all about domain-mapping and I totally fall down this time

Thank you