Domain Mapping Issue on Multisite Install

Hello,

I have a question regarding multisite/addon domain/domain mapping – hope someone can give me a brief explanation because I’ve been searching forums and google about this but I couldn’t get an answer.

1. First I have a domain name “maindomain.com” (Main Domain connected to my Hosting ).
2. I bought another domain “domainnumber2.com” from another registrar and put it on “AddOn Domain” to my main domain hosting account.

*Now this addon domain has this structure
– /public_html/domainnumber2.com
– domainnumber2.maindomain.com

3. I installed multisite to domainnumber2.com
4. make the multisite setup in a subdirectory format
– so if I create a a site its domainnumber2.com/site1

5. Domain maindomain.com got expired already and no longer exists.
– so if I visit domainnumber2.maindomain.com , this no longer exist.
– but domainnumber2.com as a addon domain still works.

6. I installed domain mapping to my multisite to map my sites
– I bought another domain domainmap.com
– change the DNS to my hosting DNS
– point its A record to my server IP address
– even parked the domainmap.com to my cpanel
– even tried to create CNAME to point to domainnumber2.com/site1 – which receives an error I couldnt add the CNAME. not sure if Im doing it right.
– tried to test the domain mapping on one subdirectory but at no luck even after waiting 2days to propagate the domain.

Can someone help me make the domain mapping work based on the setup of my domain and multisite?

Thanks.
Apaolo