Rename and Merge Objects & Groups
A way merge group objects into a single object and the ability to rename objects and grouped items.
You can use Cmd or Ctrl+G to group objects together. Grouped objects can be moved together and you can assign materials to the whole group.
Hi Dan! Yes, you can do both of those today with groups. Just select the objects you want to group then hit Cmd/Ctrl + G (or the group action in the action panel, or the menu option under Object > Group). Once you have it grouped it's easy to reselect to move them all together or apply materials to all selected objects. You can rename groups by clicking their name in the scene panel.
I'm still not sure about the original idea here about merging objects and groups though. Is it asking for taking 2 groups and making it one group? Or more about actually combining the meshes in some way?
In scenes with many objects it is helpful to be able to change parameters of a grouping of objects all together. For example changing mateiral property. Or simply to select and move a group of objects all at once.