use of cname

[enzo]

hi,
i want this name www.aaa.xxxx.yyyy.zz.

Is correct to use these CNAME for this domain xxxx.yyyy.zz ?
ex:
www.aaa     172800    IN     CNAME xxxx.yyyy.zz
www.bbb     172800    IN     CNAME xxxx.yyyy.zz
www.ccc     172800    IN     CNAME xxxx.yyyy.zz
www.ddd     172800    IN     CNAME xxxx.yyyy.zz