Alternative theming for subdomain I would like a different set of twig templates be used for all content that exists on a sub-domain of a website regardless of content type.

eg: 


mysite.com/article (Main site theme)
sub.mysite.com/article (New templates)


Is there any way to do this?
You could add the domain to the template names in a theme name suggestion hook for each template, but if you want to have a complete set of twig templates for each domain it might be easier to create separate themes and switch them. In custom code with a theme negotiator or with this module Domain Theme Switch.