Create custom project type (*.myproj)

I want to create a custom project type (*.myproj) which should inherit most properties of *.csproj type (minor customization is needed). I couldn't find any tutorials to achieve my requirement. Most of the tutorials are related to creating custom project type as console application. As mentioned in those tutorials it seems we have to define all the properties and functionalities on our own instead of inheriting using the existing project type. So i'm afraid it is not possible.

Appreciate your help.

Thanks,

Krishna