How do I build a new scene for a USD workflow!?

Hello! Nice shiny Forum!! :smiley:

I’m trying to figure out how to build a new USD scene for exporting to other DCC packages!?
Adding new assets from within UE, pissibly sourced from the file system as usd or Alembic data, for example.

But assembled and tracked in UE so that I can export a good USD.

I tried setting up a new stage actor and ‘adding prims’ but wasn’t able to create something that would export.

How would I do this?