Hello Anne,
Jorge's answer is good if you are familiar with DXL. However, if you don't want to create DXL scripts, you can move objects simply by cutting and pasting them where you want. I think this is easier than the drag-and-drop solution when there are a lot of objects.
To cut an object, right-click on it and select "Cut". Then, select the object where you want to paste it, right-click again, and choose "Paste", at the same level or one level down.
I hope this helps you!
Regards,