Hello,
Yes it is. I do it very often, although not via ORBX but with the .ocs (standalone project files), it should be the same (I did try with ORBX a few times).
I will demo it and post a GIF (open it in the web browser if it does not auto-play - it is not a static image screenshot!).
I go fast, because it is a GIF, but it basically comes down to
- CTRL C (or X to cut) and V to paste the elements from one scene to the other
- Combining them with Geometry Group Nodes
I could show you some more complex scenarios. In fact, I demonstrate some of that on my website:
https://www.elsksa.me/scientia/cgi-offline-rendering/octane-render-standaloneDo not hesitate if you have any questions.