The cube on the bottom is in one group and the cube on top is in another group.How can you keep them in two separate groups,but have them appear as one when not selected?

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The cube on the bottom is in one group and the cube on top is in another group.How can you keep them in two separate groups,but have them appear as one when not selected?<br><img src='https://www.fatskills.com/images5/sketchup-18.png' width='400px' >