A SharePoint site is a group of related web pages, files, and web parts where your team can work on projects and share information from anywhere on any device. You can create a single site or you can organize multiple subsites relating to a particular project, team, group, or location under a single site.
Steps to create a subsite
If you want to create a site to manage content related to an existing team site, you can create a subsite off of that site. For example, you could create a publishing site as a subsite to your team site.
Important: Subsites are currently classic SharePoint sites only. This is the case whether the subsite is created under a modern team site with an Microsoft 365 Group or if it is created under an existing classic team site. When you create a subsite, you can choose from several site templates, such as a blog, a community site, or a project site. For more information about classic SharePoint, see SharePoint classic and modern experiences.
Before creating a subsite, make sure you are at the location on your site where you want to create the new subsite. To create a subsite you need to be at least a member of the Designers group on that site. See More about sites and subsites later in this article for additional details.
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Go to the site where you want to create your subsite.
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Click Settings
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On the Site Contents page, click + New at the top of the page. If you don't see + New, click new subsite.
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Type a title, description, and URL name for the site. Also select the default language and a template. If you want to, you can also change the permissions and navigation settings for the site on this page.
For more information about templates, see Using templates to create different kinds of SharePoint sites.
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Click Create.
Note: SharePoint classic blogs are being retired. Beginning January 18th, 2020, the classic blog site template name will change to "Blogs (retired)". Beginning July 17th, 2020, the ability to create new classic blog sites through the user interface will be turned off.
For an alternative to classic blogs, see Creating a blog with communication sites and news posts.
More about sites and subsites
SharePoint sites are grouped together into a site collection, also know as the top-level or root site. When you create a site, you are creating it within a site collection. The site collection requires site collection administrator permissions to manage.
Wherever you are in the site hierarchy, a higher level site is called a parent site, while a lower level site is called a subsite or child site.
Whether you are permitted to create sites and pages depends on how your organization has configured the permissions for the site. If you don't have permission to create a site, you'll see a message that says, "You are not allowed to create team sites at <name of your top-level site>." Contact your administrator for proper permissions.
Should I create a site or a subsite?
Create a new site if you have permission to do so and if you don't want the site to inherit the appearance, permissions, and navigation of the parent site. Create a subsite under a parent site if you want to organize your content that way and if you want the site to inherit these settings from its parent site by default. (You can change the permission settings at any time after).
