If you want to edit multiple 3D objects together in a layout space (duplicate, copy, move, cut, delete) you can now, after marking, combine these 3D objects to a group with the menu items Edit > Other > Group. You can subsequently undo the grouping again with Edit > Other > Ungroup.
Example:Several terminals with end brackets are grouped into one terminal block:
Then the terminal block as a whole is moved:
See also
Working with Element Groups