How to set up www (cname) on subdomain

I am trying to setup “www” on my subdomain,
example:
www.sub.example.com

sub.example.com is working fine and what I did is pointing “sub” A record to ip.
i tried to add a cname record(www) to “sub.example.com” but it says
An A, AAAA or CNAME record already exists with that host. (Code: 81053).
i want something like, www.sub.example.com should be pointed to sub.example.com.

Thank in advance

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Hi there. I think you may need to put the www.sub portion in the ‘name’ column and then example.com in the domain column. You should also read this perhaps:
https://support.cloudflare.com/hc/en-us/articles/219453397-Can-I-use-Cloudflare-SSL-certificates-on-my-fourth-level-subdomain-

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