You can group multiple objects and then move and resize them as a single object. For this, just select the required objects, and click the Group button to the right of the bounding box.

There are two ways to select multiple objects:

1. Click-and-drag over the objects. This works fine when the objects you need do not overlap with objects that you do not want to include into the group.
2. Hold down Ctrl or Shift and click the required objects one by one. A repeated click over an object will deselect it.

To duplicate and delete objects, use the respective buttons to the right of the bounding box. Alternatively, you can use the standard Ctrl+С > Ctrl+V shortcuts to duplicate objects, and the Delete or Backspace key to remove objects from the canvas.