Instead of individually finding and selecting each sketch, plane, axis, image, and body on different planes, you can easily select groups of those items in the Items manager. Then, you can apply transformations on them or use Boolean tools (Union, Subtract, and Intersect). When you create new 3D bodies this way, those new items are named after the original bodies’ names in the Items manager.
For example, you can freely move or rotate selected items:
Or use tools such as Union on selected items: 