How to Create Multisite Setup in Magento?

This article will help you better understand the process of creating multiple sites using multi-domains.Let’s say, you want to run multi sites using domains such as domain1, domain2, and domain3. The website is the top-level container for sites, shipping methods, payment methods, and so on.Each website and each store view must have a unique identifier. The store is contained in a website. In turn, a store contains at least one store view.

To create websites and stores:

Goto Admin > System > Configuration > Manage Stores > Create Website

Fill the Website information

website form

Goto Admin > System > Configuration > Manage Stores > Create Store

store

Fill the Store information

store form

Goto Admin > System > Configuration > Manage Stores > Create Store View

store view

Fill the Store View information

store view form

You need to complete the store creation is to configure its settings through the configuration of your Magento.

Goto Admin > System > Configuration > Current Configuration Scope 

scope

Goto Admin > System > Configuration > Current Configuration Scope > select the Website that you created > Web > Type Base URL for your store under Unsecure and Secure section.