How to unlink a retrieved Domain that was pointed to my new Domain website?

​I decided to purchase back a deleted domain name and at that time of retrieving it, the only options were to transfer from provider or to point it to existing domain. I chose to point it to my existing domain since I assumed both the retrieved domain name and the new domain name were both from homestead.​

​Now that the retrieved domain name is pointing to my current website (under a new domain name), I can't seem to do another website using the retrieved domain.​

​Can you assist by letting me know what I need to do in order to have 2 separate websites (1 with my retrieved domain name and my current website with my new domain name)?​