Adding my .as files to specific areas on my stage

I’m fairly new to ActionScript 3.0 and I have been learning from books and online tutorials. I feel like I am getting the hang of the .as files and have made a few 3D objects that I would like to display on my time line/in my final movie. Here’s an example of what I mean:

I made Cabinet3D.as, which uses Triangle.as, Points3D.as and Light.as to build and “light” a 3D video game cabinet. If I add Cabinet3D to the Document class box, it works just like I want it to, but now I want to add 3 of these cabinets to the stage, in 3 specific spots, and have them as a background as users interact with the rest of the site.

How do I get them on to the stage, specifically where I want them?

I uploaded .fla files, but they’re really .as files, if they help. Thanks in advance for any help.