subdomains

I am a newbie here, i apologize if the question is already in the faq..
I've just signed up for a discountasp.net webhosting service. I have a website www.belebala.com.hk and i need to redirect all request to the subdomains *.belebala.com.hk to belebala.com.hk and i have a default.aspx script to handle the request according to the subdomain names. Can it be done on the discountasp.net dns servers? can the dns servers route all request to the subdomains to my ip/domain? right now I am using dyndns.org dns service and if discoutasp dns service can't do it, i will keep on using dyndns.org's service. However, is it possible for me to keep using dyndns.org's dns server without switching to NS1.DISCOUNTASP.NET and NS2.DISCOUNTASP.NET? and still get my domain correctly routed to my page on discountasp.net?

Thanks a lot! Any help is greatly appreciated!

 

I just added the subdomain add on and it shows up in my account.

However how do i specify in the control panel what subdomain something belongs to? or assign directories to a subdomain. or do I have the wrong idea of what it does?

Thanks.