Can I point a subdomian to gtm wideip?

Hi,

 

We have a parent domain xyz.com. And I have a URL test.nus.xyz.com where nus is the name of the datacenter.

 

Can I create a CNAME test.nus.xyz.com pointing to test.wideip.xyz.com. And then create LTM VIPS under it.

 

I tested doing one and while doing a nslookup its not working, wideip is showing green though since LTM VIP is up.