Change current domain resource limits

[erikb5]

I've started using Plesk8 with my ISP, and I had a default set of resources.
I then purchased more resources (more databases and more subdomains),
and I do see my new values in my client's limits panel.

Yet, my current existing domain is still limited to 1 subdomain
and 1 database.

How can I refresh the limits of my domain to take into account the
newer available resources, without removing my domain and creating \
a new one ?

Thanks,
Erik