Is that a domain that you purchased from Shopify, or is that a domain from a third party host?
Sorry for the delayed response there. If you own a Shopify managed domain and you'd like to transfer it to a different store, you can do so from within the admin of the original store, as long as the domain is eligible for transfer. Is the original store open, closed, or frozen? Thanks!
No worries at all, we should be able to remove that for you. We'll just need to authenticate your account and get proof of ownership of the domain from you. I'll follow up with you via email shortly and we can go from there! Thanks.