i want to add more than one domain in one installation

Hello friends,
I want to add more than one domain in one installation as default but it show only primary domain for all domain name.
like:-www.dostsabha.com
dostsabha.com
xyz.com
but thease domains only redirect to my primary domain (www.dostsabha.com) after when user click on any link or menu.
Please help to work all domain name in one installation.

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