Creating a new subdomain for my existing store

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We have an existing site with registered URL domain as That URL is working fine. Our shopify managed domain is which of course was set-up before we actually named the site.


We want to create a subdomain called "".  We will use that URL to link to a 3rd party app that we installed and is used by our partners. I've been told to use a C-Name.


So the question is:

1.  Where do I go to create a C-Name?

2.  My redirect is to a 3rd pary app URL so I think the URL mapping is done outside of Shopify but not sure where.


Any help is appreciated. Thanks