Not able to use assets from multiple .REAL files... how can this be??

I am hoping it may just be me not knowing how to to a simple task that you regularly are able to do across ALL other Adobe applications:

1. being able to keep multiple Aero project files at the same time,

2. be able to copy/paste assets from one project to another.

How can it be that each time I try to load/import an additional .real file, it completely blanks out what I was working on, and replaces it with the newly uploaded file. Please help me out, hopefuly there is a way to do this simple copy/paste action you normally do on ANY application in the universe.

Thanks for any help.

All the best,
Max