Creating custom WIM with Microsoft Deployment Toolkit

Hi,

I'm getting started with MDT 2010 and have a question about creating custom WIMs. I regularly capture WIMS of computers using Imagex (i.e. imagex /capture c: f:\fileshare\image.wim "Drive C") in a PE environment and I'd like to try to use MDT for this process instead of imagex if possible. With MDT you start the reference computer with the PE CD and you can capture a custom WIM but Windows 7 is then deployed to the target computer which I don't want to do. I'd like to know if there is a way to create a WIM of a reference computer and import it into the MDT database without deploying Windows 7 to that computer.

Thank You!

brian