How to set up a subdomain under a subdomain

Hello everybody,

this is my first post to the SEO forum.
I actually don't know if this would be the best category to place my question but correct me if I am wrong.

This is the case:

I have one domain at Hostgator with 5 subdomains. The subdomains have their own domains thanks to the addon domain function in Cpanel. So in total I have 6 websites live (one on the TPL domain and 5 in the subdomains)

Now I want to give each 6 websites a wordpress blog.

Unfortunally I cannot choose the option in Cpanel for creating a subdomain for each blog because the subdomain will be placed directly under the TPL domain. I need a subdomain under a subdomain for the blogs.

Alternative I could make a new directory in each subdomain for the wordpress blog to install but the the url would then be mydomain.com/blog instead of blog.mydomain.com

I prefer the blog.mydomain.com for all 6 websites but how do I realize this?

I hope I made my problem clear to everyone.

gr,
Peter