Can I add a SketchUp Group without changing existing Scenes

[dezmo]

New elements automatically show in all scenes

Beside what @DaveR suggested… You can hide the Tags by desired Scenes without extension like on the animation below: Actually when the “Scene Update” popup appears it is “enough” if the Visible Tags tick-box marked. When you select the Scenes, left mouse click with Ctrl or Shift can be used as usual, at least on Windows … [tagvisbyscence] You Can use similar technique with the Outliner Tray for components / groups.