Further tips on importing
The Import function will import items into the same topics as they appeared in the original course. If you need to move them around once the import is complete, use the arrow icon to the right of any items to drag them up or down the page.
You should not import Turnitin assignments. Doing this creates a duplicate of the original Turnitin submission inbox which means any submissions made to either of them will become mixed up in the same inbox.