You can unload objects from an assembly or a system if they are no longer
used within the session. Unloading objects enables you to only display the useful objects and
to free memory.
Warning:
The unload operation cannot be undone. To reload unloaded objects, reopen the data.
You cannot unload a root object in the tree.
The selected objects are unloaded in all edition tabs since there is only one memory for
each session.
Before you begin: To avoid losing modifications, save the objects before unloading them.