Sub domain with .net versions

view story

http://forums.cpanel.net – I create an account with domain and use asp .net framework (2.0) And I created a portal section under sub-domain with it but it is developed by asp.net frame 4.0 How can I use both asp.net 2.0 and 4.0 under the same account. It is make conflict with me. I was used websitepanel and it is easy to do that with many sub-domains with different .net versions also php versions. (HowTos)