postfix + subdomains

Hi I have problem
I create server with default domain www.example.net next creating subdomains ok works fine. Creating then users & email but i don't have choice domains + subdomains automatic selected is subdomain

 

If you don't need email addresses for a certain subdomain, just select "External Mailserver" for that subdomain on the "Options" tab.

 

Hmm
I want local mail server and choice betwen domain or subdomain.
Is the option in edit form to enable choice ?

 

I using 2.3.1 dev version

 

Till means this will be available in a future release, not in any of the current ones...