dns point : sub.domain to sub2.domain ?

How can i point sub.domain.com to the ip sub2.domain.com is pointing to ? .

i need it coz i wanna use no-ip.biz that gives you static address to your dinamic ip.
so for example MyComp.MyDomain.com will always go to my ip

I'm using plesk .

Thank you

 

 

 

 

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