Thx but it's not on line! ;)
There is another one inside Free DesignSpark Mechanical! ;) (A SpaceClaim light)
but it's some tricky! ;) and also not online! :( https://www.rs-online.com/designspark/mechanical-download-and-installation
Import your Step Moi File - draw anything a sphere for example
Call the Arborescence - Lock the Sphere - You can manipulate and edit your moi File! ;)


Here i keep the sphere but can erase it and change the color of the cube! ;)
It's also here a PDF3D exported and created inside Design Spark Mechanical! ;)