Guide

1. Inside your SharePoint site, head over to the left-side panel and then click 'Site Contents'.

2. After that, tap 'New' to proceed.

3. Choose 'Subsite' from the list of options.

4. One by one, provide all the required subsite information. For instance, specify your preferred Title, Description, Website Address, Language, Template, Access, and Permissions.

5. Once done, tap 'Create' to generate and save a new subsite for the selected SharePoint site.