Subsites are no longer recommended in modern SharePoint Online information architecture – So subsites creation is disabled by default. What if you have to create a subsite even when the subsite creation is disabled globally at the tenant level?
Well, here is the trick to create a subsite in SharePoint Online:
- Login to your SharePoint Online site, You won’t find the “Subsite” option under the “New” menu. Proceed clicking on Settings >> Site Settings.
- In the site settings page, Click on “Sites and Workspaces” and click on the “Create a Subsite” link (URL shortcut: /_layouts/15/mngsubwebs.aspx)
- This takes you to the new subsite creation page, where you can supply the details and create a new subsite.
Create a Subsite using PnP PowerShell
Although subsite creation is disabled in web UI, You can create a subsite using PowerShell:
#Connect to PnP Connect-PnPOnline -Url "https://Crescent.sharepoint.com/sites/Purchase/" -Interactive #Create a modern Subsite New-PnPWeb -Url "Archive" -Title "Archive" -Template "STS#3"