You are using SharePoint 2013 (SP 2013) or Office 365 (O365). You are planning to implement the Branding and customisation to your site. In this blog I will introduce how to use Design Manager in SharePoint 2013, its limitations and workarounds.
Overview You are using SharePoint 2013 On-Premises. You want to be able to filter the Site Templates that users see when the user tries to create a sub site. As Site administrator you can do this by navigating to Site Setting> Page layouts and site templates.