Hi Alex,
If I understood your requirement correctly, you will need multiple files to do that. The "Up" version needs to be one dataset, while the "Left" needs to be another dataset. Each dataset can share some if not all components. Inventor currently does not allow you to show "Up" and "Left" using one assembly.
Certainly if the difference in "Up" and "Left" is just component location, not geometry, you can use Positional Representation to do that.
Many thanks!
Johnson Shiue (johnson.shiue@autodesk.com)
Software Test Engineer