I've noticed that you can't create your own (like drwing on the map) Territories in MapPoint. However, I read in an archive post that you can add a layer or image over MapPoint. I was wondering how you would go about doing this, what format the file needed to be in, and how to affix it to the map.

Long story short, I have a grid (this grid has odd shapes, not just boxes) of San Antonio that I need to be placed on top of MapPoint. This way I can search for an address and see which node in the grid the address falls in. Thanks for any help you can give.