Is there a way to assign parts of a bitmap to a command button (the buttons would be somewhat irregular in size)?

I would like to create a "drill down" representation of a warehouse floor...when the user clicks on a representation for an area of the floor, an exploded version of that area would appear, etc. until they are down to the shelf and specific product they want.

I assume I can dynamically assign the drill-down graphics by using general fields within records, but how do I create the specific regions to click?

I didn't find anything like this in my searches, so I thought I'd bring this to the group.

As always, TIA.