This add-on replaces Ctrl+G by its own functionality - creating groups using regular instances

In the add-on "Group" - it is an instance, that can be edited (in the scene called "Library") by pressing Tab

Keymap:

• Ctrl+G - Make Group (Instance) from selected objects (F9 (adjust last operation) to set center of the group and set a name)

• Tab - Opens group edit mode

• Deselect everything and press Tab - Return to scene.

• Ctrl+Alt+G - Ungroup

• Ctrl+Shift+G - Advanced options like make single user, and change instance (Replace chair by another chair).

This add-on uses regular Blender instances, so you can send your blend file with "groups" made by this add-on, even if your co-worker haven't this add-on installed.