Simple question about subdomain redirection

[Midium]

Hi all,

I would truly appreciate if someone knowledgeable could point me in the right direction about the following.

I have a domain with 150 subdomains. THey are all working well. Lets call them:

sudomain1.domain.com
sudomain2.domain.com
sudomain3.domain.com
sudomain4.domain.com
sudomain5.domain.com

I would like to do the following in one of the subdomains, for example, subdomain3.domain.com

I would like to display that subdomain as a different domain... that is, display what i have hosted in subdomain3.domain.com now, when i use:

newdomain.com

I have already pointed newdomain.com to the IP that hold this subdomain, but now i do not know how to direct within Plesk, newsubdomain.com to display whay is currenlt being displayed in subdomain3.domain.com

Your help pointing me in the correct direction would be deeply appreciated. Thanks!