Wulcan, Creating a "relief" from a bitmap is a more specialized softwrae. Most "Cam" packages will offer something like this. THere is a free one to use with MoI called ZSurf. Find it here:

http://mwt.net/~sjedging/ZSURF4.zip

Read a bit about it from here:

http://www.kf12.com/blogs/techno/2007/08/zsurf/

I wouldnt start with the 6500 dollar software. There are other options.

With that being said, you can save your corel drawing as a dxf and work it in MoI too. THis would be manual modeling and not the same as the relief thing, and, why not just draw it in MoI now!