We have an existing site with registered URL domain as www.expertmarketplace.net. That URL is working fine. Our shopify managed domain is expert-assembly-shop.myshopify.com which of course was set-up before we actually named the site.
We want to create a subdomain called "provider.expertmarketplace.net". 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.