A lot of trial and error but I guess I'll answer my own question since i finally figured it out and in case this helps anyone else.
From the picture I posted before, what I finally got to work was of course to have my LOR network at the top. I then moved my Universe 6 just under the LOR network. I also created 2 other universes for 4 & 5, but not sure if they are totally needed but I set them to 510 channels each. It then successfully imported in. But my Universe 6 DMX items were importing in starting at address 2522. Not sure where it gets that start address but when I moved the LOR back to the bottom and moved my Universe 6 back after the Universe 5 that I had created, it's start channel was only at 1914. So I created a NULL universe with 608 channels and placed that before my Universe 6 and that put my Universe 6 correctly starting at 2522. The props I created for this universe then started at 2522 also. At least in the preview everything seems to be working fine now. Hopefully this weekend I'll give it a test to export it to my RPi and see if it actually works.